feat: DuckDB quantiles in-process (gcc CGO), not Ladybug.

OQ3: internal/duckstats + bin/qa/stats.go. Zig stays Ladybug-only.
mikefarah/yq for small structured slices. Gitea #30.

.dockerignore

@@ -3,6 +3,7 @@
 var
 .git
 .github
+lib-ladybug
 __pycache__
 *.pyc
 *.lbug

.github/workflows/ci.yml

@@ -37,31 +37,61 @@ jobs:
           bash -n bin/db/ssh-tunnel
           bash -n bin/docker-entrypoint
           bash -n bin/kb/search
+          bash -n bin/cgo/zig
+          sh -n bin/cgo/zcc
+          sh -n bin/cgo/zc++
 
       - name: Python unit tests (offline, vendored tools)
         run: |
           uv run python -m unittest discover -s bin/tools -t .
 
-      - name: Go tests (root module, no ladybug cgo)
+      - name: Go tests (root module; duckdb-go CGO via gcc, no ladybug)
         run: |
-          go vet ./...
-          go test ./... -count=1
+          CC=gcc CXX=g++ CGO_CFLAGS= CGO_LDFLAGS= go vet ./...
+          CC=gcc CXX=g++ CGO_CFLAGS= CGO_LDFLAGS= go test ./... -count=1
 
       - name: brain ranking tests (no cgo / no ladybug)
         run: go test ./internal/brain/rank -count=1
 
       - name: facts/audit self (lexicon consistency, no network)
-        run: |
-          ./bin/facts/audit self 2>/dev/null || echo "audit: not yet implemented; gate skipped"
+        run: ./bin/facts/audit self
 
-      - name: kb/eval recall gate
+      - name: CGO via Zig (compile brain/search + eval)
         run: |
-          ./bin/kb/eval 2>/dev/null || echo "eval: not yet implemented; gate skipped"
+          chmod +x bin/cgo/zig bin/cgo/zcc bin/cgo/zc++
+          bin/cgo/zig go build -tags system_ladybug -o /tmp/brain-search ./bin/brain/search.go
+          bin/cgo/zig go build -tags 'system_ladybug,brain_eval' -o /tmp/brain-eval ./bin/brain/eval.go
+
+      - uses: actions/cache@v4
+        with:
+          path: ~/.cache/huggingface
+          key: ${{ runner.os }}-hf-potion-multilingual-128M
+
+      - name: recall@5 SoT (Zig bin/brain/eval.go)
+        run: |
+          uv run python bin/kb/index --rebuild --json
+          KB_ROOT="$PWD" /tmp/brain-eval --json
+
+  ocr:
+    name: OCR (tesseract fixture)
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+      - name: Install tesseract + poppler
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y --no-install-recommends \
+            tesseract-ocr tesseract-ocr-eng tesseract-ocr-deu poppler-utils
+      - name: Go OCR tests (synthetic HELLO PNG)
+        run: go test ./internal/ocr -count=1
 
   release:
     name: Release (semver)
     if: github.event_name == 'push' && github.ref == 'refs/heads/main'
-    needs: test
+    needs: [test, ocr]
     runs-on: ubuntu-latest
     permissions:
       contents: write

.gitignore

@@ -11,3 +11,6 @@ __pycache__/
 .secrets/
 lib-ladybug/
 go.work.local
+models/
+# Purged from git history. Do not re-add.
+docs/crm-associations-proof.md

AGENTS.md

@@ -3,7 +3,8 @@
 Evidence-first brain over the ops/eSlider stack. Facts need proof or they are
 `(not confirmed)`.
 
-Read first: [PLAN](PLAN.md) → [docs](docs/).
+Read first: [PLAN](PLAN.md) → [docs](docs/) → [roadmap](docs/roadmap.md)
+(epic [#16](https://git.produktor.io/eSlider/2dph/issues/16)).
 
 ## Method (detective, no fork)
 
@@ -15,6 +16,9 @@ Read first: [PLAN](PLAN.md) → [docs](docs/).
 - `info` root = descriptive/narrative leafs, searchable, never asserted as fact.
 - Search is deduction: `facts` → `info` → `web-search` (second independent
   source). An answer is `confirmed` only if it comes off the facts root.
+- Fact-check every *claim* (facts → info → live → web), not every edit or
+  syntax tweak. PicoClaw: `search` then `get` then `audit` before a factual
+  reply (`skills/picoclaw/SKILL.md`). `throttled` is not a negative finding.
 
 ## Hard rules
 
@@ -36,17 +40,22 @@ PLAN.md       decisions + execution + open questions
 docs/         published docs
 skills/       in-project agent skills (vendored, no external links)
 bin/          self-describing tools bin/{subject}/{method}.go (shebang)
-bin/brain/    search.go serve.go index.go get.go stats.go eval.go watch.go
+bin/brain/    search.go serve.go index.go add.go get.go stats.go eval.go watch.go
 bin/chats/    sync.go import.go facts.go apply.go; libs in internal/chats
-bin/mail/     sync.go import.go (index_mail → brain/index.go)
-bin/markdown/ import.go (mistune leafs)
+bin/mail/     sync.go import.go ocr.go (index_mail → brain/index.go)
+bin/markdown/ import.go (H2 leaf split; Python bin/md/import fallback)
 bin/postgres/ query.go (read-only YAML)
-internal/     shared Go (brain/rank is cgo-free; chats parsers too)
+bin/git/      import.go (go-git history; Python shim execs it)
+bin/web/      search.go (SearXNG; Python shim execs it)
+bin/reasoner/ bakeoff.go (D18 CPU OpenAI tool-call bake-off)
+internal/     shared Go (brain/rank is cgo-free; chats parsers; gitlog; websearch; reasoner; duckstats)
+bin/qa/       stats.go (DuckDB quantiles / JSONL count; gcc CGO, not Zig)
 bin/watch/    corpus watcher (used by bin/brain/watch.go)
 bin/tools/    vendored python libs behind bin/* (kblib, yamlout, websearch)
-bin/docker-entrypoint  container entrypoint (brain index|search|serve|watch)
+bin/cgo/      zig zcc zc++ (CGO via zig cc, not gcc)
+bin/docker-entrypoint  container entrypoint (api: serve|search|watch; index: python)
 compose.yaml  docker composition (root level, not docker/)
-Dockerfile    multi-stage: python deps + static Go binaries
+Dockerfile    api (Zig CGO, no Python) + index (Python write)
 var/          kb.lbug, var/mail/*, caches (gitignored)
 .venv/        ladybug + model2vec + mistune
 ```
@@ -57,37 +66,52 @@ var/          kb.lbug, var/mail/*, caches (gitignored)
 bin/mail/sync.go --source onlyoffice,gmail --workers 8 --out var/mail   # raw message.json + attachments
 bin/mail/sync.go --source gmail --query 'from:example.com' --out var/mail  # Gmail search (default in:inbox)
 bin/mail/import.go --from-raw var/mail                                  # message.json → message.md (convert only)
-bin/brain/index.go --rebuild                                            # rebuild brain incl. all mail (fresh DB)
+bin/brain/index.go --rebuild --with-facts --with-chats
 ```
 
 - `sync` (Go) downloads messages + attachments; Gmail uses paginated list +
   `body.attachmentId` (not partId) for attachments.
 - `import` converts body + attachments to markdown. PDFs use poppler
-  `pdftotext -layout` fast path (~15ms); textless/scanned PDFs fall back to
-  docling (isolated subprocess — its native onnx can segfault the parent).
-  Conversion never touches the brain DB (crash safety).
-- `index_mail` is a deprecation shim for `bin/brain/index.go --rebuild`. Ladybug
-  corrupts its WAL when brand-new leafs are bulk-inserted while FTS/vector
-  indexes exist; a fresh DB with indexes created last is the only safe path.
+  `pdftotext -layout` fast path (~15ms); textless/scanned PDFs use
+  `pdftoppm` + tesseract `eng+deu` (`bin/mail/ocr.go`). Optional
+  `OCR_ENGINE=paddle`. Conversion never touches the brain DB (crash safety).
+- `index_mail` is a deprecation shim for `bin/brain/index.go --rebuild`. Bulk
+  rebuild still deletes `var/kb.lbug` and creates FTS/HNSW last. Single-leaf
+  write is `bin/brain/add.go` (safe while indexes exist; do not DROP INDEX).
   Keep conversion + indexing separate so a conversion crash can't leave the
   DB mid-transaction.
 
 ## Tools
 
 ```bash
-bin/facts/audit ["self"|"facts"|"info"|"stale"]   # 2-source + staleness gate
-bin/facts/crm [--dry-run]                         # proof person↔company/company↔project (ooCRM × corpus SoT)
+bin/facts/audit.go ["self"|"facts"|"info"|"stale"]  # 2-source + staleness gate
+bin/facts/crm.go [--dry-run]                       # proof person↔company/company↔project (ooCRM × corpus SoT)
 bin/kb/search "query" [--repo X]                  # deprecated wrapper → bin/brain/search.go
 bin/brain/search.go "query" [--root facts|info]   # deduction search → YAML
-bin/brain/get.go <id> [--body]
-bin/markdown/import.go [dir]                      # mistune leaves → YAML
+bin/brain/search.go "query" --no-web              # local graph only
+eval "$(bin/cgo/zig env)"                         # Zig cc + liblbug (not gcc)
+bin/brain/index.go --rebuild [--with-mail] [--with-facts] [--with-chats]
+bin/brain/add.go --text T --root facts --source "a.md x b.md"  # incremental write
+bin/brain/add.go --json                                      # stdin leaf or {leafs:[...]}
+bin/brain/get.go <id> [--body] [--json]          # Go read; Python bin/kb/get CI fallback
+bin/brain/stats.go [--json]
+bin/brain/eval.go [--json]                       # recall@5; questions in internal/brain/rank
+bin/brain/serve.go                               # HTTP :8630; GET /openapi.json POST /mcp
+bin/markdown/import.go [dir]                      # H2 leafs → YAML; Python bin/md/import fallback
+bin/git/import.go [REPO] [--json] [--limit N]     # go-git history → commit leafs
+bin/web/search.go "query" [--json]                # SearXNG; throttled ≠ absence
+bin/reasoner/bakeoff.go [--model ID] [--json]     # D18 CPU tool-call bake-off
 bin/postgres/query.go --profile onlyoffice -c 'SELECT 1'
+bin/qa/stats.go                                  # D22 DuckDB quantiles / JSONL (gcc CGO)
+bin/mail/ocr.go <image|pdf>                      # tesseract eng+deu (scans)
 bin/md/tables                                     # what the graph holds → YAML
 bin/brain/deduce "question"                       # thinking wrapper
 ```
 
 Never start a shell command with `cd` — use the tool working-directory
-parameter. Search before reading whole files.
+parameter. Search before reading whole files. For YAML/JSON/XML/CSV/TOML/HCL
+prefer mikefarah/yq (`skills/yq/SKILL.md`). For bulk rows and quantiles use
+duckdb-go (`internal/duckstats`, `skills/duckdb/SKILL.md`), not Ladybug.
 
 ## GitHub safety rules (ABSOLUTE — never violate)
 

Dockerfile

@@ -1,5 +1,13 @@
 # syntax=docker/dockerfile:1
-FROM python:3.12-slim AS base
+#
+#   docker build --target api -t 2dph:api .
+#   docker build --target index -t 2dph:index .
+#
+# API: Go + ladybug via Zig CGO (no CPython).
+# Index: Python write path (profile `index` until brain/add is v2).
+
+# --- Python sidecar (Ladybug write / rebuild) ---
+FROM python:3.12-slim AS index
 
 ENV PYTHONUNBUFFERED=1 \
     PYTHONDONTWRITEBYTECODE=1 \
@@ -8,26 +16,16 @@ ENV PYTHONUNBUFFERED=1 \
 
 WORKDIR /app
 RUN id -u 2dph 2>/dev/null || useradd --create-home --uid 1001 2dph
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends \
+         poppler-utils tesseract-ocr tesseract-ocr-eng tesseract-ocr-deu \
+    && rm -rf /var/lib/apt/lists/*
 
-# deps layer-first: rebuild only on dependency change
 COPY requirements.lock.txt /tmp/requirements.lock.txt
 RUN python -m pip install --no-cache-dir -r /tmp/requirements.lock.txt \
     && rm /tmp/requirements.lock.txt
 
-# Go services: static binaries, no interpreter at runtime
-FROM golang:1.25 AS go-build
-WORKDIR /src
-COPY go.mod ./
-COPY bin/server ./bin/server
-COPY bin/watch ./bin/watch
-RUN CGO_ENABLED=0 go build -o /serve ./bin/server \
-    && CGO_ENABLED=0 go build -o /watch ./bin/watch
-
-# runtime: python toolchain + Go services
-FROM base
 COPY . .
-COPY --from=go-build /serve /app/bin/serve
-COPY --from=go-build /watch /app/bin/watch
 RUN chmod +x /app/bin/docker-entrypoint \
     && chown -R 2dph:2dph /app
 USER 2dph
@@ -37,5 +35,51 @@ ENV PATH="/app/bin:${PATH}" \
     KB_ROOT=/app
 HEALTHCHECK --interval=30s --timeout=5s --start-period=10s --retries=3 \
     CMD python -c "import model2vec, ladybug, mistune; print('ok')" || exit 1
+ENTRYPOINT ["/app/bin/docker-entrypoint"]
 
-ENTRYPOINT ["/app/bin/docker-entrypoint"]
+# --- Go API: CGO with Zig, not gcc ---
+FROM golang:1.26-bookworm AS api-build
+WORKDIR /src
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends curl xz-utils ca-certificates \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY bin/cgo ./bin/cgo
+RUN chmod +x bin/cgo/zig bin/cgo/zcc bin/cgo/zc++ \
+    && ./bin/cgo/zig env >/dev/null
+
+COPY go.mod go.sum ./
+RUN go mod download
+
+COPY . .
+ENV CGO_RPATH=/usr/local/lib
+RUN eval "$(./bin/cgo/zig env)" \
+    && go build -tags brain_serve,system_ladybug -o /out/brain-serve ./bin/brain/serve.go \
+    && go build -tags system_ladybug -o /out/brain-search ./bin/brain/search.go \
+    && CGO_ENABLED=0 go build -tags brain_watch -o /out/brain-watch ./bin/brain/watch.go
+
+FROM debian:bookworm-slim AS api
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends libssl3 ca-certificates wget \
+    && rm -rf /var/lib/apt/lists/* \
+    && useradd --create-home --uid 1001 2dph
+COPY --from=api-build /out/brain-serve /usr/local/bin/brain-serve
+COPY --from=api-build /out/brain-search /usr/local/bin/brain-search
+COPY --from=api-build /out/brain-watch /usr/local/bin/brain-watch
+COPY --from=api-build /src/lib-ladybug/liblbug.so.0.19.1 /usr/local/lib/liblbug.so.0.19.1
+COPY bin/docker-entrypoint /usr/local/bin/docker-entrypoint
+RUN chmod +x /usr/local/bin/docker-entrypoint \
+    && ln -s liblbug.so.0.19.1 /usr/local/lib/liblbug.so.0 \
+    && ln -s liblbug.so.0 /usr/local/lib/liblbug.so \
+    && ldconfig
+USER 2dph
+ENV KB_ROOT=/data \
+    KB_PORT=8630 \
+    LD_LIBRARY_PATH=/usr/local/lib \
+    HF_HOME=/data/hf
+WORKDIR /data
+EXPOSE 8630
+HEALTHCHECK --interval=30s --timeout=5s --start-period=10s --retries=3 \
+    CMD wget -qO- http://127.0.0.1:8630/health || exit 1
+ENTRYPOINT ["/usr/local/bin/docker-entrypoint"]
+CMD ["serve"]

PLAN.md

@@ -4,7 +4,10 @@ A brain that loves facts and deduction. Evidence-first knowledge graph + hybrid
 RAG over the operational Brain/ops/eSlider stack. Built like Sherlock
 Holmes: nothing is asserted unless it has proof.
 
-Status: **in progress** — this file is the plan and the record of decisions.
+Status: **v1 in** (epic [#16](https://git.produktor.io/eSlider/2dph/issues/16) closed).
+v2 board: milestone [v2](https://git.produktor.io/eSlider/2dph/milestone/13) — OCR [#6](https://git.produktor.io/eSlider/2dph/issues/6),
+[#29](https://git.produktor.io/eSlider/2dph/issues/29) OQ1, [#30](https://git.produktor.io/eSlider/2dph/issues/30) OQ3.
+Gap: [docs/roadmap.md](docs/roadmap.md).
 
 ## What
 
@@ -26,12 +29,12 @@ detective method: **a fact needs ≥2 independent sources or it is
 |---|----------|--------|
 | D1 | RAG corpus | ops stack (chat, onlyoffice, gitea/NPM, searchxng, observability, ai-bot, mcp-servers, `~/.ssh/config`) + portfolio. Exclude `office.dev` + jobs/applications. |
 | D2 | skill merging | integrate skills **in this project** `skills/`; skip gitea / brain-dependent skills. |
-| D3 | web search | Vendored client; SearXNG URL is config. Optional Compose instance (sanitized settings). Do not run a second copy on a host that already has one. Empty/`throttled` ≠ “nothing exists”. |
+| D3 | web search | Go client `bin/web/search.go` (`internal/websearch`). SearXNG URL is config (`BRAIN_SEARCH_URL`). Optional Compose profile `searxng` (sanitized settings). Do not run a second copy on a host that already has one. Empty/`throttled` ≠ “nothing exists”. |
 | D4 | embeddings | **model2vec** `minishlab/potion-multilingual-128M` instead of embeddinggemma. |
 | D5 | parser | **mistune** for MD → leaf extraction (duckdb-md documented as future optional SQL/export layer, not v1). |
-| D6 | graph engine | **LadybugDB**. Go is the service (`bin/brain/search.go`, `internal/brain`); Python remains for index/write until the Go write path is safe. |
+| D6 | graph engine | **LadybugDB**. Go is the service (`bin/brain/search.go`, `bin/brain/serve.go` in-process, `internal/brain`). Read path is Go + Zig CGO (D21). Python `bin/kb/{get,stats,eval}` is the CI fallback when Zig/libs are not fetched. Incremental write is Python `bin/kb/add` (`bin/brain/add.go`). Bulk rebuild stays `compose --profile index` until the Go write path is safe. |
 | D7 | db access | `db-yaml`/`psql-yq`-style, read-only, YAML out. OnlyOffice Postgres via SSH tunnel (`127.0.0.1:5433`). |
-| D8 | evidence | detective method: ≥2 independent sources or `(not confirmed)`. Auto-pair docker ps × compose × ssh-config × docs. |
+| D8 | evidence | detective method: ≥2 independent sources or `(not confirmed)`. 2-source auto-pair docker ps × compose × ssh-config × docs. |
 | D9 | facts/goal model | Who / What / How / Where / When + evidence + confidence on every edge. |
 | D10 | versioning | everything is a leaf with `sha256 + observed_at + source_rev`; `File-[:HAS_VERSION]->Commit-[:AUTHORED]->Person`. Stale = `source_rev` < git HEAD. |
 | D11 | strong/weak | `root` column: `facts` (strong) vs `info` (weak). Answer is `confirmed` only from facts root. |
@@ -40,8 +43,12 @@ detective method: **a fact needs ≥2 independent sources or it is
 | D14 | tooling style | `bin/{subject}/{method}.go` shebang (e.g. `bin/brain/search.go`). Shared code in `internal/`. One root `go.mod` + `go.work`. No `bin/*/main.go`, no nested modules. |
 | D15 | repo | Gitea [`eSlider/2dph`](https://git.produktor.io/eSlider/2dph) is origin + [issues](https://git.produktor.io/eSlider/2dph/issues). GitHub `eSlider/2dph` is the public clone (PRs + Actions CI). No direct `main` pushes. TDD → PR → CI green → merge. |
 | D16 | contradictions | ≥2 yes vs ≥2 no → unrelated sources conflict → hypothesis → `(not confirmed)`. Resolution (authority, staleness adjudication) = **v2**, tracked as open question. |
-| D17 | assertion gate | Fact-check every *claim* (facts → info → live sources → web), not every edit. Missing graph ≠ “does not exist”. |
-| D18 | reasoner | Pluggable OpenAI-compatible URL. RAM: Qwen3.5-9B. Quality: Bonsai-27B or Qwen3.6-27B. No official Qwen3.6-9B. |
+| D17 | assertion gate | Fact-check every *claim* (facts → info → live → web), not every edit. `bin/brain/search.go` adds a `web` block when there is no facts hit (`throttled`/`skipped`/`refused` ≠ absence). `--root` and `--no-web` stay local. Missing graph ≠ “does not exist”. |
+| D18 | reasoner | Pluggable OpenAI-compatible URL (`REASONER_BASE_URL`). RAM: `Qwen/Qwen3.5-9B`. Quality: `prism-ml/Bonsai-27B-gguf` or `Qwen/Qwen3.6-27B`. No official Qwen3.6-9B. CPU bake-off: `bin/reasoner/bakeoff.go` + compose profile `reasoner` (`OLLAMA_NUM_GPU=0`, `:11435`). PicoClaw is compose profile `picoclaw`; tools are `search`/`get`/`audit`. Weights are not copied into the 2dph image. Agent lever/loop: [#15](https://git.produktor.io/eSlider/2dph/issues/15). |
+| D19 | git history | [go-git](https://github.com/go-git/go-git) via `bin/git/import.go`. No subprocess of the git binary. Conversion prints commit leafs; brain write is `bin/brain/index.go`. |
+| D20 | agent API | OpenAPI + MCP are generated from the same `internal/httpapi.Ops` table as `bin/brain/serve.go` handlers. `GET /openapi.json`, `POST /mcp` (JSON-RPC tools/list + tools/call). Tool names match OpenAPI paths (`search`/`get`/`stats`/`audit`/`ingest`). |
+| D21 | CGO | Ladybug/tokenizers CGO is compiled with **Zig** (`bin/cgo/zcc` → `zig cc -target …-linux-gnu`), not gcc. `bin/cgo/zig` pins Zig 0.14.1 + liblbug 0.19.1 + libtokenizers 1.27.0. Compose `target: api` has no CPython; write/rebuild is profile `index`. |
+| D22 | analytics | **duckdb-go** in-process (`internal/duckstats`, `bin/qa/stats.go`) for quantiles/JSONL. Links with **gcc/g++**, not Zig. Ladybug stays the graph; web-search cache stays modernc sqlite. Slice small structured docs with **mikefarah/yq**, not kislyuk/jq. [#30](https://git.produktor.io/eSlider/2dph/issues/30). |
 
 ## Architecture
 
@@ -49,23 +56,30 @@ detective method: **a fact needs ≥2 independent sources or it is
 2dph/
   PLAN.md / AGENTS.md
   docs/                     published docs (this conversation → docs/ as md)
-  skills/                   in-project skills (web-search, db-yaml, kb-search, agent-cost, diataxis-docs, …)
+  skills/                   in-project skills (web-search, postgres, brain, picoclaw, diataxis-docs)
   bin/
-    facts/extract           auto-pair 2 sources → lexicon yaml + graph
-    facts/audit             ["self"|"facts"|"info"|"stale"] 2-source + staleness gate
-    kb/index                Python write path (called by bin/brain/index.go)
+    facts/extract.go audit.go crm.go  # D14 shebang; Python implementation
+    kb/index                Python bulk write (called by bin/brain/index.go)
+    kb/add                  Python incremental write (called by bin/brain/add.go)
     brain/index.go          rebuild FTS + HNSW (incl. --with-mail)
-    brain/get.go stats.go eval.go watch.go
+    brain/add.go            incremental leaf write (no rebuild)
+    brain/get.go stats.go eval.go  # Go read (cgo); Python bin/kb/* CI fallback
+    brain/watch.go
     brain/search.go         deduction: facts → info → web-search
-    brain/serve.go          HTTP API (internal/httpapi)
+    brain/serve.go          HTTP API in-process + OpenAPI/MCP (D20); Zig CGO (D21)
+    cgo/zig zcc zc++        CGO toolchain (zig cc, not gcc)
     mail/import.go          JSON → markdown (no brain write)
-    markdown/import.go      mistune leaves
+    markdown/import.go      H2 leaf split (Go); Python bin/md/import fallback
     postgres/query.go       read-only YAML (wraps bin/db/psql-yq)
+    git/import.go           go-git history (no git binary; conversion only)
+    web/search.go           SearXNG client (throttled ≠ absence)
+    reasoner/bakeoff.go     CPU tool-call bake-off (D18; OpenAI tools)
     chats/sync.go import.go facts.go apply.go
                             (libs in internal/chats; no chats index)
+    mail/ocr.go             tesseract eng+deu (pdftoppm scans)
     md/import               (deprecated; bin/markdown/import.go)
     brain/extract  brain/audit   brain/deduce    (thinking wrapper)
-    web/search               (vendored)
+    web/search               (deprecated shim → web/search.go)
     db/psql-yq               (vendored)
     ssh-tunnel               onlyoffice pg tunnel 5433
   var/kb.lbug               single embedded store (gitignored)
@@ -76,7 +90,10 @@ detective method: **a fact needs ≥2 independent sources or it is
 
 Node tables: `Person, Service, Host, Container, Repo, File, Commit, Leaf`.
 `Leaf(embedding FLOAT[N])` — FTS on `text`, HNSW vector index on `embedding`.
-Edges: `RUNS / USES / HAS_VERSION / AUTHORED / ABOUT / ASSOCIATED / SIMILAR_0.85`.
+Edges: `RUNS / USES / FROM_FILE / HAS_VERSION / AUTHORED / ABOUT / ASSOCIATED / SIMILAR_0.85`.
+`FROM_FILE` / `HAS_VERSION` / `AUTHORED`: `bin/brain/search.go --hop N` walks
+them from each hit (1=File, 2=Commit, 3=Person). Rebuild writes
+`Leaf-[:FROM_FILE]->File`; git import writes the rest.
 
 Common props on every node/edge: `root`, `confidence`, `evidence[]`, `how`,
 `where`, `when`, `source_rev`.
@@ -94,17 +111,20 @@ Common props on every node/edge: `root`, `confidence`, `evidence[]`, `how`,
 
 - `bin/{subject}/{method}` — line 2 is a usage comment (mirrors `psql-yq`).
 - bash + python primary; golang via Go shebang when a compiled helper is right.
-- YAML default output, `--json` for machines. Slice with `yq`.
+- YAML default output, `--json` for machines. Slice with mikefarah/yq.
 - Everything that touches the network / DB is read-only, throttled, cached.
 - Tests (TDD) gate every commit; `gh` + CI/CD on every push.
 
 ## Open questions (v2)
 
 - OQ1: mutually-contradicting evidence — how to resolve (authority weighting,
-  temporal freshness, audit adjudication).
-- OQ2: OCR pipeline for pdfs/images/docs — mostly solved: poppler pdftotext
-  fast-path for born-digital PDFs, docling fallback for the ~5% textless ones.
-- OQ3: optional duckdb-md layer for `SELECT … FORMAT MARKDOWN` export/write-back.
+  temporal freshness, audit adjudication). **v2**; [#29](https://git.produktor.io/eSlider/2dph/issues/29).
+- OQ2: OCR — **in**. `pdftotext -layout` first; scans `pdftoppm` + tesseract
+  `eng+deu` (`bin/mail/ocr.go`, `internal/ocr`). No gocv, no gosseract CGO
+  (D21 Zig owns Ladybug CGO). Optional `OCR_ENGINE=paddle` / compose profile
+  `ocr-paddle`. Docling left the default path. [#6](https://git.produktor.io/eSlider/2dph/issues/6).
+- OQ3: **in** — duckdb-go (`internal/duckstats`, `bin/qa/stats.go`) for
+  quantiles / JSONL count. Not a second graph. [#30](https://git.produktor.io/eSlider/2dph/issues/30).
 - OQ4: YAML-first storage for leafs — deferred: JSON is ~10x faster to
   serialize and unambiguous; YAML only where humans edit files.
 
@@ -113,7 +133,8 @@ Common props on every node/edge: `root`, `confidence`, `evidence[]`, `how`,
 1. `bin/mail/sync.go` (Go, 8 workers) — paginated Gmail/OnlyOffice download.
    Gmail attachments key off `body.attachmentId`, not MIME `partId`.
 2. `bin/mail/import.go --from-raw` — message.json → message.md; PDFs via
-   `pdftotext -layout` (~15ms) with docling subprocess fallback; ICS sidecars
+   `pdftotext -layout` (~15ms); textless/scanned PDFs `pdftoppm` + tesseract
+   `eng+deu`. ICS sidecars
    Latin-1→UTF-8 normalized.
 3. `bin/brain/index.go --rebuild` — fresh rebuild (repo corpus + mail) because ladybug
    corrupts its WAL on bulk-insert into an already-indexed DB. Conversion and
@@ -129,9 +150,10 @@ Common props on every node/edge: `root`, `confidence`, `evidence[]`, `how`,
 1. go vet + go test ./... (root module; packages without ladybug cgo)
 2. `go test ./internal/brain/rank` (cgo-free ranking + flag parser)
 3. python -m unittest discover -s bin/tools (includes published-docs SoT)
-4. bin/facts/audit self  (lexicon internal consistency)
-5. bin/brain/eval.go       (recall@5 ≥ 0.95, gates index regressions)
-6. md-docs build/lint if docs tooling arrives.
+4. `bin/facts/audit self` (lexicon internal consistency; `bin/facts/audit.go` is the D14 wrapper)
+5. `bin/brain/eval.go` via Zig (recall@5 ≥ 0.95). Python `bin/kb/eval` is an
+   explicit fallback, not the CI SoT.
+6. `bin/cgo/zig go build -tags system_ladybug` (compile search with zig cc; fetches pinned zig+libs).
 
 Feedback loop: every commit → PR → CI → green/gate → merge. Same discipline as
 `db/tech-poc`: contract first where there is an OpenAPI/message shape.
@@ -140,9 +162,26 @@ Feedback loop: every commit → PR → CI → green/gate → merge. Same discipl
 
 1. scaffold repo (:done after this file + AGENTS.md + .gitignore + ci)
 2. gh repo create eSlider/2dph --private + initial commit + CI
-3. vendored skill integration (web-search, db-yaml, kb-search, agent-cost, diataxis-docs) — no remote links
+3. vendored skill integration (web-search, postgres, brain, diataxis-docs) — no remote links
 4. .venv: ladybug + model2vec + mistune
 5. schema + tools with TDD (kb + md + facts + brain)
 6. ~/.config/brain config
-7. corpus extraction (facts/info)
-8. verify: web-search smoke, onlyoffice pg, md-db round-trip, eval, audit
+7. corpus extraction (facts/info) — **in**: [#18](https://git.produktor.io/eSlider/2dph/issues/18)
+8. verify: web-search smoke, onlyoffice pg, md-db round-trip, eval, audit
+
+## Gap to v1 (epic #16)
+
+Remaining: none for epic #16 (v1). Board:
+[epic #16](https://git.produktor.io/eSlider/2dph/issues/16),
+milestone [v1 detective brain](https://git.produktor.io/eSlider/2dph/milestone/12).
+Narrative: [docs/roadmap.md](docs/roadmap.md).
+
+| Order | Issue | Gap |
+|-------|-------|-----|
+| 1 | [#14](https://git.produktor.io/eSlider/2dph/issues/14) | **in** — `bin/brain/add.go` / `POST /ingest` write facts+info without deleting `kb.lbug`. Bulk corpus still `--rebuild`. Leftover Python (mail/facts) is not the living-graph blocker. |
+| 2 | [#17](https://git.produktor.io/eSlider/2dph/issues/17) | **in** — `--hop N` walks `FROM_FILE` → `HAS_VERSION` → `AUTHORED` (max 3). |
+| 3 | [#18](https://git.produktor.io/eSlider/2dph/issues/18) | **in** — `--with-facts` / `--facts-json` land `root=facts`; `--with-chats` indexes `var/chats/md`. WhatsApp sync is out of v1. |
+| 4 | [#15](https://git.produktor.io/eSlider/2dph/issues/15) | **in** — lever/loop documented (`search` → `get` → `audit`). |
+| 5 | [#19](https://git.produktor.io/eSlider/2dph/issues/19) | **in** — CI recall SoT is `bin/brain/eval.go` via Zig. Python `bin/kb/eval` stays as an explicit fallback. |
+
+Does **not** block epic close: OQ1 [#29](https://git.produktor.io/eSlider/2dph/issues/29), OQ3 [#30](https://git.produktor.io/eSlider/2dph/issues/30), OQ4. OCR [#6](https://git.produktor.io/eSlider/2dph/issues/6) is **in**.

README.md

@@ -7,14 +7,16 @@
 [![Latest Release](https://img.shields.io/github/v/tag/eSlider/2dph?sort=semver&label=release)](https://github.com/eSlider/2dph/releases)
 [![GitHub Stars](https://img.shields.io/github/stars/eSlider/2dph?style=social)](https://github.com/eSlider/2dph/stargazers)
 
-An evidence-first brain over the operational eSlider stack. **Facts need two
-independent sources, or they are `(not confirmed)`.**
+An evidence-first brain. **Facts need two independent sources, or they are
+`(not confirmed)`.** Cursor is not the runtime.
 
-`2dph` is a single embedded knowledge graph (LadybugDB = Kuzu successor) with
-native **HNSW vector** + **BM25 full-text** indexes, built from markdown,
-compose files, ssh config, docker state, and git history. Search is
-*deduction*: confirmed facts first, supporting info second, `web-search` as
-the independent second source when the local graph cannot confirm.
+`2dph` is a single embedded knowledge graph (LadybugDB) with native **HNSW
+vector** + **BM25 full-text** indexes. Search is *deduction*: confirmed facts
+first, supporting info second, `web-search` as the independent second source
+when the local graph cannot confirm.
+
+Run it: [docs/runbook.md](docs/runbook.md). Design: [docs/design.md](docs/design.md).
+Docs index: [docs/README.md](docs/README.md).
 
 ## Architecture
 
@@ -28,10 +30,10 @@ graph TB
     end
 
     subgraph dph["2dph tools"]
-        EX["bin/facts/extract<br/>2-source pairing"]
-        AU["bin/facts/audit<br/>confidence + staleness"]
+        EX["bin/facts/extract.go<br/>2-source pairing"]
+        AU["bin/facts/audit.go<br/>confidence + staleness"]
         IDX["bin/brain/index.go<br/>chunk + embed"]
-        MD["bin/markdown/import.go<br/>mistune leaves"]
+        MD["bin/markdown/import.go<br/>H2 leaf split"]
         SR["bin/brain/search.go<br/>deduction"]
     end
 
@@ -74,7 +76,7 @@ graph TB
 ## The method
 
 Every assertion is `Who / What / How / Where / When + evidence + confidence`,
-mirroring the detective detective skill: **≥2 independent sources confirm a
+mirroring the detective method: **≥2 independent sources confirm a
 fact; conflicting sources or a single source → `hypothesis` → `(not confirmed)`.**
 
 | root | meaning | used for answers |
@@ -85,72 +87,100 @@ fact; conflicting sources or a single source → `hypothesis` → `(not confirme
 ## Deduction search
 
 ```bash
-bin/brain/search.go "Matrix federation over HTTPS"   # facts → info → web-search
+bin/brain/search.go "Matrix federation over HTTPS"   # facts → info → web
 bin/brain/search.go "onlyoffice postgres" --root facts
 bin/brain/search.go "where is cs-lexicon" --json | yq '.'
+bin/brain/search.go "upstream flag" --no-web         # local graph only
 bin/brain/get.go <id> --body                         # full chunk on demand
 bin/brain/stats.go                                   # index health
 bin/brain/eval.go                                    # recall@5 gate
 ```
 
-`--hop` is not implemented (needs File/FROM_FILE edges); the flag errors instead of walking. `bin/kb/search` is a deprecated wrapper around `bin/brain/search.go`.
+`--hop N` walks File/Commit/Person from each hit (max 3). `bin/kb/search` is a deprecated wrapper around `bin/brain/search.go`.
+
+Git history is read with [go-git](https://github.com/go-git/go-git) (no git binary):
+
+```bash
+bin/git/import.go --json --limit 100              # commit leafs for this repo
+bin/git/import.go --root "$PROJECTS_ROOT" --json  # one pass per .git under root
+```
+
+Conversion only. Graph write (`File-[:HAS_VERSION]->Commit-[:AUTHORED]->Person`) stays with `bin/brain/index.go`.
+
+Web search (second independent source) goes through SearXNG. Empty results mean **throttled**, not “nothing exists”:
+
+```bash
+bin/web/search.go "LadybugDB vector index" --json
+# Optional local instance (skip if BRAIN_SEARCH_URL already points at one):
+# SEARXNG_SECRET=$(openssl rand -hex 32) docker compose --profile searxng up -d
+```
 
 Mail is a first-class corpus (retrievable through the same search):
 
 ```bash
 bin/mail/sync.go --source onlyoffice,gmail --workers 8 --out var/mail  # raw sync (Go)
 bin/mail/import.go --from-raw var/mail                                  # JSON → markdown
+bin/brain/add.go --text T --root facts --source "a.md x b.md"
+bin/brain/index.go --rebuild --with-facts --with-chats                  # facts extract + chats md
 bin/brain/index.go --rebuild                                            # rebuild brain (incl. mail)
 bin/brain/search.go "invoice from last week"                            # same search over mail leafs
 ```
 
 ## Storage
 
-- **LadybugDB** — single `var/kb.lbug`, Cypher property graph, HNSW + BM25
-  in one engine, embedded (no server), ACID, read-only-safe for concurrent
-  readers. **Never `DROP INDEX` FTS/VECTOR** on Ladybug 0.19: DROP leaves
-  ghost catalog tables (`_0_Leaf_vec_UPPER`) so recreate fails while
-  `SHOW_INDEXES` omits HNSW. Fresh indexes = delete `var/kb.lbug` +
-  `bin/brain/index.go --rebuild`. Use `ensure_indexes()` after upserts.
-- **model2vec** — `potion-multilingual-128M` static embeddings (256-dim),
-  CPU-fast, deterministic, no Ollama runtime dependency.
-- facts and info split semantically by `root` column but written inside the
-  same transaction.
+- **LadybugDB** — single `var/kb.lbug`, Cypher + HNSW + BM25, embedded.
+  Read tools (`get` / `stats` / `eval`) are Go + Zig CGO (`bin/cgo/zcc`).
+  Python fallbacks stay for CI until the runner fetches Zig. Incremental
+  write is `bin/brain/add.go` (Python `kblib.add_leafs`). Bulk rebuild is
+  Compose profile `index` (`bin/brain/index.go --rebuild`).
+- **model2vec** — `potion-multilingual-128M` (256-dim), CPU, no Ollama
+  runtime dependency.
+- facts and info split by `root` but written in the same transaction.
+
+Ladybug 0.19 DROP INDEX warning: [docs/runbook.md](docs/runbook.md).
 
 ## Tooling conventions
 
 `bin/{subject}/{method}.go` — self-describing: shebang on line 1, usage comment
 from line 2. Shared code in `internal/`. YAML default output, `--json` for
-machines. Tests gate every commit. HTTP: `bin/brain/serve.go` (default search
-binary `var/bin/brain-search`, not Python).
+machines. Tests gate every commit. HTTP: `bin/brain/serve.go` calls
+`internal/brain` in-process (`/health` `/search` `/get` `/stats` `/audit` `/ingest` `/openapi.json` `/mcp`).
 
 ## Development
 
+See the portable runbook: [docs/runbook.md](docs/runbook.md).
+
 ```bash
-uv venv .venv                                  # Python 3.12, uv-managed
-uv pip install -r requirements.lock.txt        # pinned toolchain
-bin/facts/audit self                           # lexicon consistency gate
-go test ./... && python -m unittest discover -s bin/tools -t .
+uv venv .venv
+uv pip install -r requirements.lock.txt
+bin/facts/audit.go self
+go test ./... && uv run python -m unittest discover -s bin/tools -t .
 ```
 
 Docker (optional, cached model + var volumes):
 
 ```bash
-docker compose run --rm brain index            # (re)index corpus
-docker compose run --rm brain search "query"   # one-shot query
-docker compose run --rm brain serve            # bin/brain/serve.go
+docker compose up -d brain                     # API (Zig CGO serve :8630)
+docker compose --profile index run --rm index  # Python Ladybug rebuild
+docker compose --profile picoclaw up brain-mcp # MCP on 127.0.0.1:8630
+docker compose --profile reasoner up -d reasoner  # CPU Ollama 127.0.0.1:11435
 docker compose up brain-watch                  # auto re-index on change
 ```
 
 ## Related
 
+eSlider DevOps engineer practice: ops, OnlyOffice, and mail feed the facts
+root through `bin/facts/extract` (two-source pairing).
+
 - [go-second-brain](https://github.com/eSlider/go-second-brain) — the earlier
   Neo4j + Qdrant + Matrix RAG brain
 - [agent-skills](https://github.com/eSlider/agent-skills) — upstream
-  skills (`web-search`, `db-yaml`, …) that 2dph integrates
+  skills (`web-search`, `postgres`, …) that 2dph integrates
 - detective method — the two-source method
 
-Work board (issues): [git.produktor.io/eSlider/2dph/issues](https://git.produktor.io/eSlider/2dph/issues).
+Work board (issues): [epic #16](https://git.produktor.io/eSlider/2dph/issues/16)
+on [git.produktor.io/eSlider/2dph/issues](https://git.produktor.io/eSlider/2dph/issues).
 PRs and CI: GitHub [`eSlider/2dph`](https://github.com/eSlider/2dph).
 
-See [PLAN.md](PLAN.md) for decisions, execution status, and v2 open questions.
+See [PLAN.md](PLAN.md) for decisions, [docs/roadmap.md](docs/roadmap.md) for
+the gap to v1, and v2 open questions.

bin/brain/add.go

@@ -0,0 +1,21 @@
+//usr/bin/env go run -tags=brain_add "$0" "$@"; exit
+//go:build brain_add
+//
+// bin/brain/add.go - incremental leaf write (Python kblib, no rebuild).
+//
+//	./bin/brain/add.go --text T --root facts --source "a.md x b.md"
+//	./bin/brain/add.go --json
+//
+// D6: write stays Python. Does not delete var/kb.lbug.
+// NOTE: never run `gofmt -w` on this file — it breaks the shebang.
+package main
+
+import (
+	"os"
+
+	"github.com/eSlider/2dph/internal/cmdbin"
+)
+
+func main() {
+	os.Exit(cmdbin.ExecFile("bin/kb/add", os.Args[1:]))
+}

bin/brain/eval.go

@@ -1,20 +1,22 @@
-//usr/bin/env go run -tags=brain_eval "$0" "$@"; exit
-//go:build brain_eval
+//usr/bin/env go run -tags=system_ladybug,brain_eval "$0" "$@"; exit
+//go:build cgo && system_ladybug && brain_eval
 //
 // bin/brain/eval.go - recall@5 gate.
 //
 //	./bin/brain/eval.go
 //	./bin/brain/eval.go --json
 //
+// Needs CGO + libladybug. Python bin/kb/eval is the CI fallback (no cgo).
+// Control questions live in internal/brain/rank (cgo-free).
 // NOTE: never run `gofmt -w` on this file — it breaks the shebang.
 package main
 
 import (
 	"os"
 
-	"github.com/eSlider/2dph/internal/cmdbin"
+	"github.com/eSlider/2dph/internal/brain"
 )
 
 func main() {
-	os.Exit(cmdbin.ExecFile("bin/kb/eval", os.Args[1:]))
+	os.Exit(brain.MainEval(os.Args[1:]))
 }

bin/brain/get.go

@@ -1,20 +1,23 @@
-//usr/bin/env go run -tags=brain_get "$0" "$@"; exit
-//go:build brain_get
+//usr/bin/env go run -tags=system_ladybug,brain_get "$0" "$@"; exit
+//go:build cgo && system_ladybug && brain_get
 //
 // bin/brain/get.go - read one leaf by id.
 //
 //	./bin/brain/get.go <id>
 //	./bin/brain/get.go <id> --body
+//	./bin/brain/get.go <id> --json
 //
+// Needs CGO + libladybug. Python bin/kb/get is the CI fallback (no cgo).
+// CGO compiler is Zig (`eval "$(bin/cgo/zig env)"`), not gcc.
 // NOTE: never run `gofmt -w` on this file — it breaks the shebang.
 package main
 
 import (
 	"os"
 
-	"github.com/eSlider/2dph/internal/cmdbin"
+	"github.com/eSlider/2dph/internal/brain"
 )
 
 func main() {
-	os.Exit(cmdbin.ExecFile("bin/kb/get", os.Args[1:]))
+	os.Exit(brain.MainGet(os.Args[1:]))
 }

bin/brain/index.go

@@ -3,12 +3,12 @@
 //
 // bin/brain/index.go - rebuild the Ladybug graph (Python write path).
 //
-//	./bin/brain/index.go --rebuild
+//	./bin/brain/index.go --rebuild --with-facts --with-chats
 //	./bin/brain/index.go --rebuild --with-mail
 //	./bin/brain/index.go --dry-run --with-mail
 //
-// v1 write is always a rebuild when mail is included (live FTS/HNSW + bulk
-// insert corrupts Ladybug 0.19 WAL). `add` is v2.
+// v1 write: bin/brain/add.go for one/few leafs (indexes may already exist).
+// Bulk mail/corpus still --rebuild (fresh file, indexes last).
 // NOTE: never run `gofmt -w` on this file — it breaks the shebang.
 package main
 

bin/brain/search.go

@@ -3,11 +3,11 @@
 //
 // bin/brain/search.go - deduction search over the 2dph brain.
 //
-//	./bin/brain/search.go "query" [--root facts|info] [--repo P] [-n N] [--json]
+//	./bin/brain/search.go "query" [--root facts|info] [--repo P] [-n N] [--hop N] [--json] [--no-web]
 //	./bin/brain/search.go serve [port]
 //	./bin/brain/search.go --list-model
 //
-// Needs CGO + libladybug (CGO_CFLAGS/CGO_LDFLAGS). Prefer the wrapper
+// Needs CGO + libladybug via Zig (`eval "$(bin/cgo/zig env)"`), not gcc.
 // bin/kb/search which sets those and builds a binary for the embed daemon.
 // NOTE: never run `gofmt -w` on this file — it breaks the shebang.
 package main

bin/brain/serve.go

@@ -1,18 +1,23 @@
-//usr/bin/env go run -tags=brain_serve "$0" "$@"; exit
-//go:build brain_serve
+//usr/bin/env go run -tags=brain_serve,system_ladybug "$0" "$@"; exit
+//go:build brain_serve && cgo && system_ladybug
 //
-// bin/brain/serve.go - HTTP API for the 2dph brain.
+// bin/brain/serve.go - HTTP API (in-process ladybug search).
 //
 //	KB_ROOT=/path/to/2dph ./bin/brain/serve.go
-//	KB_SEARCH_CMD=... KB_WORKERS=4 KB_PORT=8630 ./bin/brain/serve.go
+//	KB_WORKERS=4 KB_PORT=8630 ./bin/brain/serve.go
 //
-// Default search backend is var/bin/brain-search (Go), not Python.
+//	GET  /openapi.json  same Ops table as the handlers
+//	POST /mcp           JSON-RPC tools/list + tools/call
+//
+// Needs CGO + libladybug (same as bin/brain/search.go).
 // NOTE: never run `gofmt -w` on this file — it breaks the shebang.
 package main
 
 import (
+	"log"
 	"os"
 
+	"github.com/eSlider/2dph/internal/brain"
 	"github.com/eSlider/2dph/internal/httpapi"
 )
 
@@ -22,5 +27,8 @@ func main() {
 			os.Setenv("KB_ROOT", wd)
 		}
 	}
-	httpapi.Run()
+	if err := brain.Ready(); err != nil {
+		log.Fatal(err)
+	}
+	httpapi.Run(brain.HTTP{})
 }

bin/brain/serve_exec.go

@@ -0,0 +1,20 @@
+//go:build brain_serve && !system_ladybug
+//
+// Fallback serve when ladybug cgo is not in the build (CI / tags=brain_serve).
+// Production shebang is serve.go (in-process).
+package main
+
+import (
+	"os"
+
+	"github.com/eSlider/2dph/internal/httpapi"
+)
+
+func main() {
+	if os.Getenv("KB_ROOT") == "" {
+		if wd, err := os.Getwd(); err == nil {
+			os.Setenv("KB_ROOT", wd)
+		}
+	}
+	httpapi.Run(nil)
+}

bin/brain/stats.go

@@ -1,20 +1,21 @@
-//usr/bin/env go run -tags=brain_stats "$0" "$@"; exit
-//go:build brain_stats
+//usr/bin/env go run -tags=system_ladybug,brain_stats "$0" "$@"; exit
+//go:build cgo && system_ladybug && brain_stats
 //
 // bin/brain/stats.go - index health.
 //
 //	./bin/brain/stats.go
 //	./bin/brain/stats.go --json
 //
+// Needs CGO + libladybug. Python bin/kb/stats is the CI fallback (no cgo).
 // NOTE: never run `gofmt -w` on this file — it breaks the shebang.
 package main
 
 import (
 	"os"
 
-	"github.com/eSlider/2dph/internal/cmdbin"
+	"github.com/eSlider/2dph/internal/brain"
 )
 
 func main() {
-	os.Exit(cmdbin.ExecFile("bin/kb/stats", os.Args[1:]))
+	os.Exit(brain.MainStats(os.Args[1:]))
 }

bin/cgo/zc++

@@ -0,0 +1,23 @@
+#!/bin/sh
+# bin/cgo/zc++ — CGO CXX. Zig, not g++.
+set -eu
+ROOT="$(CDPATH= cd -- "$(dirname "$0")/../.." && pwd)"
+case "$(uname -m)" in
+  x86_64|amd64) TARGET=x86_64-linux-gnu ;;
+  aarch64|arm64) TARGET=aarch64-linux-gnu ;;
+  *)
+    echo "zc++: unsupported arch $(uname -m)" >&2
+    exit 2
+    ;;
+esac
+if [ -n "${ZIG:-}" ] && [ -x "$ZIG" ]; then
+  :
+elif [ -x "$ROOT/var/zig/zig" ]; then
+  ZIG="$ROOT/var/zig/zig"
+elif command -v zig >/dev/null 2>&1; then
+  ZIG="$(command -v zig)"
+else
+  echo "zc++: zig missing; run bin/cgo/zig first" >&2
+  exit 127
+fi
+exec "$ZIG" c++ -target "$TARGET" "$@"

bin/cgo/zcc

@@ -0,0 +1,24 @@
+#!/bin/sh
+# bin/cgo/zcc — CGO CC. Zig, not gcc.
+# Go invokes CC with many args; a wrapper avoids spaces in $CC.
+set -eu
+ROOT="$(CDPATH= cd -- "$(dirname "$0")/../.." && pwd)"
+case "$(uname -m)" in
+  x86_64|amd64) TARGET=x86_64-linux-gnu ;;
+  aarch64|arm64) TARGET=aarch64-linux-gnu ;;
+  *)
+    echo "zcc: unsupported arch $(uname -m)" >&2
+    exit 2
+    ;;
+esac
+if [ -n "${ZIG:-}" ] && [ -x "$ZIG" ]; then
+  :
+elif [ -x "$ROOT/var/zig/zig" ]; then
+  ZIG="$ROOT/var/zig/zig"
+elif command -v zig >/dev/null 2>&1; then
+  ZIG="$(command -v zig)"
+else
+  echo "zcc: zig missing; run bin/cgo/zig first" >&2
+  exit 127
+fi
+exec "$ZIG" cc -target "$TARGET" "$@"

bin/cgo/zig

@@ -0,0 +1,130 @@
+#!/usr/bin/env bash
+# bin/cgo/zig — CGO toolchain: zig cc (not gcc) + pinned liblbug + libtokenizers.
+#
+#   eval "$(bin/cgo/zig env)"     # export CC/CXX/CGO_*
+#   bin/cgo/zig go build ...      # ensure, then exec with env
+#   bin/cgo/zig ./bin/brain/search.go "query"
+#
+# Pins live in this file. Downloads land in var/ (gitignored).
+set -euo pipefail
+
+ROOT="$(CDPATH= cd -- "$(dirname "$0")/../.." && pwd)"
+ZIG_VERSION=0.14.1
+LBUG_VERSION=0.19.1
+TOKENIZERS_VERSION=1.27.0
+
+arch="$(uname -m)"
+case "$arch" in
+  x86_64|amd64)
+    ZIG_ARCH=x86_64
+    LBUG_ARCH=x86_64
+    TOK_ARCH=x86_64
+    ZIG_SHA=24aeeec8af16c381934a6cd7d95c807a8cb2cf7df9fa40d359aa884195c4716c
+    LBUG_SHA=ed263ae913f68cb0ddba0b98548b58edaac49929766d03bdaaa83be46c68847d
+    TOK_SHA=72556cdca798dd4ea7cdaba308e5f0d68a8cb93b67c96edf485b7a0edd7b07f4
+    ;;
+  aarch64|arm64)
+    ZIG_ARCH=aarch64
+    LBUG_ARCH=aarch64
+    TOK_ARCH=aarch64
+    ZIG_SHA=f7a654acc967864f7a050ddacfaa778c7504a0eca8d2b678839c21eea47c992b
+    LBUG_SHA=b07df2cd533c3976a2a3025866d6420a5f35514d0a822ecc4b2902d55b4725b7
+    TOK_SHA=e96545ad05930c26f51f63d932ee6d3bbd32bbed149e102c5290d587a2293067
+    ;;
+  *)
+    echo "bin/cgo/zig: unsupported arch $arch" >&2
+    exit 2
+    ;;
+esac
+
+CACHE="$ROOT/var/cache"
+LIB="$ROOT/lib-ladybug"
+ZIG_DIR="$ROOT/var/zig-dist"
+ZIG_BIN="$ROOT/var/zig/zig"
+
+sha256of() {
+  if command -v sha256sum >/dev/null 2>&1; then
+    sha256sum "$1" | awk '{print $1}'
+  else
+    shasum -a 256 "$1" | awk '{print $1}'
+  fi
+}
+
+fetch() {
+  local url="$1" dest="$2" expect="$3"
+  if [ -f "$dest" ] && [ "$(sha256of "$dest")" = "$expect" ]; then
+    return 0
+  fi
+  mkdir -p "$(dirname "$dest")"
+  echo "fetch $url" >&2
+  curl -fsSL "$url" -o "$dest"
+  local got
+  got="$(sha256of "$dest")"
+  if [ "$got" != "$expect" ]; then
+    echo "checksum mismatch $dest: got $got want $expect" >&2
+    rm -f "$dest"
+    exit 1
+  fi
+}
+
+ensure_zig() {
+  if [ -n "${ZIG:-}" ] && [ -x "$ZIG" ]; then
+    return 0
+  fi
+  if [ -x "$ZIG_BIN" ]; then
+    export ZIG="$ZIG_BIN"
+    return 0
+  fi
+  if command -v zig >/dev/null 2>&1; then
+    export ZIG
+    ZIG="$(command -v zig)"
+    return 0
+  fi
+  local tar="$CACHE/zig-${ZIG_ARCH}-linux-${ZIG_VERSION}.tar.xz"
+  fetch "https://ziglang.org/download/${ZIG_VERSION}/zig-${ZIG_ARCH}-linux-${ZIG_VERSION}.tar.xz" \
+    "$tar" "$ZIG_SHA"
+  mkdir -p "$CACHE"
+  rm -rf "$ZIG_DIR"
+  tar -xJf "$tar" -C "$CACHE"
+  mv "$CACHE/zig-${ZIG_ARCH}-linux-${ZIG_VERSION}" "$ZIG_DIR"
+  mkdir -p "$ROOT/var/zig"
+  ln -sfn "$ZIG_DIR/zig" "$ZIG_BIN"
+  export ZIG="$ZIG_BIN"
+}
+
+ensure_libs() {
+  mkdir -p "$LIB"
+  if [ ! -f "$LIB/liblbug.so" ]; then
+    local tar="$CACHE/liblbug-linux-${LBUG_ARCH}.tar.gz"
+    fetch "https://github.com/LadybugDB/ladybug/releases/download/v${LBUG_VERSION}/liblbug-linux-${LBUG_ARCH}.tar.gz" \
+      "$tar" "$LBUG_SHA"
+    tar -xzf "$tar" -C "$LIB"
+  fi
+  if [ ! -f "$LIB/libtokenizers.a" ]; then
+    local tar="$CACHE/libtokenizers.linux-${TOK_ARCH}.tar.gz"
+    fetch "https://github.com/daulet/tokenizers/releases/download/v${TOKENIZERS_VERSION}/libtokenizers.linux-${TOK_ARCH}.tar.gz" \
+      "$tar" "$TOK_SHA"
+    tar -xzf "$tar" -C "$LIB"
+  fi
+}
+
+print_env() {
+  printf 'export ZIG=%q\n' "$ZIG"
+  printf 'export CC=%q\n' "$ROOT/bin/cgo/zcc"
+  printf 'export CXX=%q\n' "$ROOT/bin/cgo/zc++"
+  printf 'export CGO_ENABLED=1\n'
+  printf 'export CGO_CFLAGS=%q\n' "-I$LIB"
+  printf 'export CGO_LDFLAGS=%q\n' "-L$LIB -Wl,-rpath,${CGO_RPATH:-$LIB}"
+}
+
+ensure_zig
+ensure_libs
+
+cmd="${1:-env}"
+if [ "$cmd" = "env" ]; then
+  print_env
+  exit 0
+fi
+
+eval "$(print_env)"
+exec "$@"

bin/chats/sync.go

@@ -29,10 +29,11 @@ func main() {
 	case "linkedin":
 		os.Exit(chats.RunSyncLinkedIn(args))
 	case "whatsapp":
-		fmt.Fprintln(os.Stderr, "chats: WhatsApp not implemented yet")
+		fmt.Fprintln(os.Stderr, "chats: WhatsApp sync is out of v1")
 		os.Exit(1)
 	case "help", "-h", "--help":
-		fmt.Fprintln(os.Stderr, `usage: bin/chats/sync.go telegram|linkedin [flags]`)
+		fmt.Fprintln(os.Stderr, `usage: bin/chats/sync.go telegram|linkedin [flags]
+WhatsApp sync is out of v1.`)
 		return
 	default:
 		fmt.Fprintf(os.Stderr, "chats: unknown platform %q\n", platform)

bin/docker-entrypoint

@@ -1,13 +1,10 @@
 #!/usr/bin/env bash
 # bin/docker-entrypoint - run 2dph tools inside the container.
 #
-#   brain                 shell (default)
-#   brain search <q>      bin/brain/search.go
-#   brain index           bin/kb/index --with-mail
-#   brain watch <dir>     compiled /app/bin/watch (bin/brain/watch.go)
-#   brain serve           compiled /app/bin/serve (bin/brain/serve.go)
-#   brain extract         bin/facts/extract (docker×compose pairing)
-#   brain audit           bin/facts/audit
+# API image (Zig CGO binaries):
+#   serve | search | watch
+# Index image (Python write path, compose profile `index`):
+#   index | extract | audit | search (deprecated python wrapper)
 #
 # Usage comment starts at line 2 (self-describing convention).
 set -euo pipefail
@@ -15,13 +12,27 @@ set -euo pipefail
 CMD="${1:-shell}"
 shift || true
 
+if [ -x /usr/local/bin/brain-serve ]; then
+	case "$CMD" in
+		shell) exec bash ;;
+		serve) exec /usr/local/bin/brain-serve "$@" ;;
+		search) exec /usr/local/bin/brain-search "$@" ;;
+		watch) exec /usr/local/bin/brain-watch "$@" ;;
+		index)
+			echo "index is the Python sidecar: docker compose --profile index run --rm index" >&2
+			exit 2
+			;;
+		*) echo "unknown command: $CMD (api: serve|search|watch)" >&2; exit 2 ;;
+	esac
+fi
+
 case "$CMD" in
-  shell) exec bash ;;
-  search) exec "$KB_PY" /app/bin/kb/search "$@" ;;
-  index) exec "$KB_PY" /app/bin/kb/index --with-mail "$@" ;;
-  watch) exec /app/bin/watch "$@" ;;
-  serve) exec /app/bin/serve "$@" ;;
-  extract) exec "$KB_PY" /app/bin/facts/extract "$@" ;;
-  audit) exec "$KB_PY" /app/bin/facts/audit "$@" ;;
-  *) echo "unknown command: $CMD" >&2; exit 2 ;;
+	shell) exec bash ;;
+	search) exec "$KB_PY" /app/bin/kb/search "$@" ;;
+	index) exec "$KB_PY" /app/bin/kb/index --with-mail "$@" ;;
+	watch) exec /app/bin/watch "$@" ;;
+	serve) exec /app/bin/serve "$@" ;;
+	extract) exec "$KB_PY" /app/bin/facts/extract "$@" ;;
+	audit) exec "$KB_PY" /app/bin/facts/audit "$@" ;;
+	*) echo "unknown command: $CMD" >&2; exit 2 ;;
 esac

bin/facts/audit.go

@@ -0,0 +1,21 @@
+//usr/bin/env go run -tags=facts_audit "$0" "$@"; exit
+//go:build facts_audit
+//
+// bin/facts/audit.go - 2-source + lexicon checks.
+//
+//	./bin/facts/audit.go self
+//	./bin/facts/audit.go db
+//
+// Python bin/facts/audit is the implementation (CI runs it directly).
+// NOTE: never run `gofmt -w` on this file — it breaks the shebang.
+package main
+
+import (
+	"os"
+
+	"github.com/eSlider/2dph/internal/cmdbin"
+)
+
+func main() {
+	os.Exit(cmdbin.ExecFile("bin/facts/audit", os.Args[1:]))
+}

bin/facts/crm.go

@@ -0,0 +1,20 @@
+//usr/bin/env go run -tags=facts_crm "$0" "$@"; exit
+//go:build facts_crm
+//
+// bin/facts/crm.go - prove person↔company / company↔project (ooCRM × corpus).
+//
+//	./bin/facts/crm.go [--dry-run] [--mismatches]
+//
+// Python bin/facts/crm is the implementation. Graph write stays Python.
+// NOTE: never run `gofmt -w` on this file — it breaks the shebang.
+package main
+
+import (
+	"os"
+
+	"github.com/eSlider/2dph/internal/cmdbin"
+)
+
+func main() {
+	os.Exit(cmdbin.ExecFile("bin/facts/crm", os.Args[1:]))
+}

bin/facts/extract.go

@@ -0,0 +1,20 @@
+//usr/bin/env go run -tags=facts_extract "$0" "$@"; exit
+//go:build facts_extract
+//
+// bin/facts/extract.go - acquire confirmed facts (2-source each).
+//
+//	./bin/facts/extract.go [--json] [--dry-run]
+//
+// Python bin/facts/extract is the implementation. Graph write stays Python.
+// NOTE: never run `gofmt -w` on this file — it breaks the shebang.
+package main
+
+import (
+	"os"
+
+	"github.com/eSlider/2dph/internal/cmdbin"
+)
+
+func main() {
+	os.Exit(cmdbin.ExecFile("bin/facts/extract", os.Args[1:]))
+}

bin/git/import

@@ -1,154 +1,26 @@
 #!/usr/bin/env python3
-"""git/import - import git history (commits, authors, files) into the brain.
+"""git/import — deprecated. Use bin/git/import.go (go-git, no git binary).
 
-  bin/git/import [REPO]                 import all commits -> leafs + graph
-  bin/git/import --json                 emit import leafs as JSON, no write
-  bin/git/import --limit 100            cap commits processed
-  bin/git/import --since 2026-01-01     only recent commits
-  bin/git/import --root DIR             run per repo dir under DIR
-  bin/git/import --no-env               never read .env anywhere (default: true)
-
-Reads `git log --no-merges --name-only` from the repo, maps commits to
-`info` leafs (root=info, type=commit) and writes the version graph
-`File -[:HAS_VERSION]-> Commit -[:AUTHORED]-> Person` into var/kb.lbug.
-Idempotent: leaf MERGE by (source,text via leaf_id), graph MERGE by sha.
+  bin/git/import.go [REPO] [--json] [--limit N] [--since DATE]
 """
 from __future__ import annotations
 
-import json
-import subprocess
+import os
 import sys
 from pathlib import Path
 
 ROOT = Path(__file__).resolve().parents[2]
-sys.path.insert(0, str(ROOT / "bin" / "tools"))
-
-from kblib import (  # noqa: E402
-    connect, ensure_indexes, init_schema, upsert_leaf,
-)
-from gitimport import commits_to_leafs, ensure_git_schema, index_commits, parse_log  # noqa: E402
-
-LOG_FMT = "--format=%x1e%H%x1f%an%x1f%ae%x1f%aI%x1f%s"
-
-
-def git_log(repo: Path, limit: int = 0, since: str = "") -> str:
-    cmd = ["git", "-C", str(repo), "log", "--no-merges", "--name-only", LOG_FMT]
-    if since:
-        cmd += ["--since", since]
-    if limit:
-        cmd += ["-n", str(limit)]
-    try:
-        out = subprocess.run(cmd, capture_output=True, text=True, timeout=120)
-    except (FileNotFoundError, subprocess.TimeoutExpired):
-        return ""
-    if out.returncode != 0:
-        print(f"git/import: {repo}: {out.stderr.strip()}", file=sys.stderr)
-        return ""
-    return out.stdout
-
-
-def repo_name(repo: Path) -> str:
-    try:
-        out = subprocess.run(
-            ["git", "-C", str(repo), "remote", "get-url", "origin"],
-            capture_output=True, text=True, timeout=20)
-        url = out.stdout.strip()
-        return url.rstrip("/").split("/")[-1].removesuffix(".git") if url else repo.name
-    except (FileNotFoundError, subprocess.TimeoutExpired):
-        return repo.name
-
-
-def embedder():
-    from model2vec import StaticModel
-    model = StaticModel.from_pretrained("minishlab/potion-multilingual-128M")
-    return lambda text: model.encode([text])[0].astype(float).tolist()
-
-
-def import_repo(conn, repo: Path, embed, limit: int, since: str,
-                no_write: bool = False) -> tuple[int, int]:
-    raw = git_log(repo, limit, since)
-    commits = parse_log(raw)
-    leafs = commits_to_leafs(commits, repo_name(repo))
-    if no_write:
-        return len(commits), 0
-    written = 0
-    for lf in leafs:
-        query = f"{lf['heading']}\n\n{lf['text']}"
-        emb = embed(lf["text"]) if lf["text"] else None
-        upsert_leaf(conn, text=query, root="info", confidence="confirmed",
-                    source=lf["source"], source_rev="git", how="git/import",
-                    loc=lf["source"], type_=lf.get("type", "commit"),
-                    embedding=emb)
-        written += 1
-    index_commits(conn, commits, repo_name(repo))
-    return len(commits), written
 
 
 def main(argv: list[str]) -> int:
-    import argparse
-    p = argparse.ArgumentParser(description="import git history into the brain")
-    p.add_argument("repo", nargs="?", default=None)
-    p.add_argument("--root", default=None, help="directory of repos to import (each git dir separately)")
-    p.add_argument("--limit", type=int, default=0)
-    p.add_argument("--since", default="")
-    p.add_argument("--json", action="store_true")
-    p.add_argument("--dry-run", action="store_true", help="parse + report, no db write")
-    a = p.parse_args(argv)
-
-    repos: list[Path] = []
-    if a.repo:
-        repos = [Path(a.repo)]
-    elif a.root:
-        root = Path(a.root)
-        if root.is_file():
-            repos = [root]
-        else:
-            repos = [dp for dp in sorted(root.iterdir()) if (dp / ".git").exists() or dp.is_file()]
-    else:
-        repos = [ROOT]
-
-    total_commits = 0
-    results: list[dict] = []
-    if a.dry_run:
-        for repo in repos:
-            if not repo.exists():
-                continue
-            commits = parse_log(git_log(repo, a.limit, a.since))
-            name = repo_name(repo)
-            total_commits += len(commits)
-            results.append({"repo": name, "commits": len(commits),
-                            "leafs": len(commits_to_leafs(commits, name)), "path": str(repo)})
-        if a.json:
-            print(json.dumps(results, indent=2))
-        else:
-            for r in results:
-                print(f"{r['repo']:<24} {r['commits']:>5} commits -> {r['leafs']} leafs  {r['path']}")
-        return 0
-
-    # Never DROP FTS/VECTOR (ghost catalog). Upsert while indexes exist is OK;
-    # ensure_indexes only CREATEs when missing.
-    db, conn = connect(ROOT / "var" / "kb.lbug", read_only=False)
-    init_schema(conn)
-    embed = embedder()
-    rows: list[dict] = []
-    for repo in repos:
-        if not repo.exists():
-            continue
-        reached, written = import_repo(conn, repo, embed, a.limit, a.since)
-        total_commits += reached
-        rows.append({"repo": repo_name(repo), "commits": reached, "written": written})
-    ensure_indexes(conn)
-    conn.close()
-    db.close()
-
-    if a.json:
-        print(json.dumps(rows, indent=2))
-    else:
-        for r in rows:
-            print(f"imported {r['commits']:>5} commits -> {r['written']} leafs  {r['repo']}")
-        print(f"total: {total_commits} commits")
-    return 0
+    print(
+        "bin/git/import is deprecated; use bin/git/import.go (go-git)",
+        file=sys.stderr,
+    )
+    target = ROOT / "bin" / "git" / "import.go"
+    os.execvp("go", ["go", "run", str(target), *argv])
+    return 1
 
 
 if __name__ == "__main__":
-    sys.exit(main(sys.argv[1:]))
+    sys.exit(main(sys.argv[1:]))

bin/git/import.go

@@ -0,0 +1,143 @@
+//usr/bin/env go run "$0" "$@"; exit
+//
+// bin/git/import.go - read git history with go-git (no git binary).
+//
+//	./bin/git/import.go [REPO]
+//	./bin/git/import.go --json
+//	./bin/git/import.go --limit 100 --since 2026-01-01
+//	./bin/git/import.go --root DIR
+//
+// Conversion only: prints commit leafs. Brain write is bin/brain/index.go.
+// NOTE: never run `gofmt -w` on this file — it breaks the shebang.
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"path/filepath"
+	"strconv"
+	"time"
+
+	"github.com/eSlider/2dph/internal/cmdbin"
+	"github.com/eSlider/2dph/internal/gitlog"
+)
+
+func main() {
+	os.Exit(run(os.Args[1:]))
+}
+
+func run(args []string) int {
+	var repo, root, since string
+	limit := 0
+	jsonOut := false
+	i := 0
+	for i < len(args) {
+		a := args[i]
+		switch {
+		case a == "--json":
+			jsonOut = true
+		case a == "--limit" && i+1 < len(args):
+			i++
+			n, err := strconv.Atoi(args[i])
+			if err != nil || n < 0 {
+				fmt.Fprintf(os.Stderr, "git/import: --limit must be a non-negative integer\n")
+				return 2
+			}
+			limit = n
+		case a == "--since" && i+1 < len(args):
+			i++
+			since = args[i]
+		case a == "--root" && i+1 < len(args):
+			i++
+			root = args[i]
+		case a == "-h" || a == "--help":
+			fmt.Fprintln(os.Stderr, `usage: bin/git/import.go [REPO] [--json] [--limit N] [--since DATE] [--root DIR]`)
+			return 0
+		case len(a) > 0 && a[0] != '-':
+			repo = a
+		default:
+			fmt.Fprintf(os.Stderr, "git/import: unknown flag %s\n", a)
+			return 2
+		}
+		i++
+	}
+
+	var sinceT time.Time
+	if since != "" {
+		var err error
+		sinceT, err = parseSince(since)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "git/import: %v\n", err)
+			return 2
+		}
+	}
+
+	repos := []string{}
+	if repo != "" {
+		repos = []string{repo}
+	} else if root != "" {
+		entries, err := os.ReadDir(root)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "git/import: %v\n", err)
+			return 1
+		}
+		for _, e := range entries {
+			p := filepath.Join(root, e.Name())
+			if _, err := os.Stat(filepath.Join(p, ".git")); err == nil {
+				repos = append(repos, p)
+			}
+		}
+	} else {
+		repos = []string{cmdbin.Root()}
+	}
+
+	opt := gitlog.Options{Limit: limit, Since: sinceT}
+	type row struct {
+		Repo    string         `json:"repo"`
+		Path    string         `json:"path"`
+		Commits int            `json:"commits"`
+		Leafs   []gitlog.Leaf  `json:"leafs,omitempty"`
+	}
+	var rows []row
+	for _, p := range repos {
+		name, err := gitlog.RepoName(p)
+		if err != nil && name == "" {
+			fmt.Fprintf(os.Stderr, "git/import: %s: %v\n", p, err)
+			continue
+		}
+		cs, err := gitlog.Log(p, opt)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "git/import: %s: %v\n", p, err)
+			return 1
+		}
+		leafs := make([]gitlog.Leaf, 0, len(cs))
+		for _, c := range cs {
+			leafs = append(leafs, gitlog.ToLeaf(c, name))
+		}
+		rows = append(rows, row{Repo: name, Path: p, Commits: len(cs), Leafs: leafs})
+	}
+
+	if jsonOut {
+		enc := json.NewEncoder(os.Stdout)
+		enc.SetIndent("", "  ")
+		enc.SetEscapeHTML(false)
+		if err := enc.Encode(rows); err != nil {
+			return 1
+		}
+		return 0
+	}
+	for _, r := range rows {
+		fmt.Printf("%-24s %5d commits  %s\n", r.Repo, r.Commits, r.Path)
+	}
+	return 0
+}
+
+func parseSince(s string) (time.Time, error) {
+	for _, layout := range []string{time.RFC3339, "2006-01-02"} {
+		if t, err := time.Parse(layout, s); err == nil {
+			return t, nil
+		}
+	}
+	return time.Time{}, fmt.Errorf("cannot parse --since %q", s)
+}

bin/kb/add

@@ -0,0 +1,114 @@
+#!/usr/bin/env python3
+"""kb/add - incremental leaf write (no rebuild).
+
+  bin/kb/add --text T --root facts|info --source S
+  bin/kb/add --json                 # stdin: one object or {"leafs":[...]}
+  bin/kb/add --db PATH --json
+
+Writes facts+info in one Ladybug transaction. Does not delete kb.lbug.
+Embedding is used when provided; otherwise model2vec encodes the text.
+"""
+from __future__ import annotations
+
+import json
+import sys
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[2]
+sys.path.insert(0, str(ROOT / "bin" / "tools"))
+
+from kblib import (  # noqa: E402
+    EMBED_DIM,
+    add_leafs,
+    connect,
+    ensure_indexes,
+    init_schema,
+)
+
+
+def _as_leafs(payload: object) -> list[dict]:
+    if isinstance(payload, list):
+        return [dict(x) for x in payload]
+    if isinstance(payload, dict):
+        if "leafs" in payload:
+            return [dict(x) for x in payload["leafs"]]
+        return [dict(payload)]
+    raise ValueError("json must be an object, a list, or {leafs:[...]}")
+
+
+def _embed_missing(leafs: list[dict]) -> None:
+    missing = [lf for lf in leafs if not lf.get("embedding")]
+    if not missing:
+        return
+    from model2vec import StaticModel
+
+    model = StaticModel.from_pretrained("minishlab/potion-multilingual-128M")
+    for lf in missing:
+        text = str(lf.get("text") or "")
+        vec = model.encode([text])[0].astype(float).tolist()
+        if len(vec) != EMBED_DIM:
+            vec = (vec + [0.0] * EMBED_DIM)[:EMBED_DIM]
+        lf["embedding"] = vec
+
+
+def main(argv: list[str]) -> int:
+    import argparse
+
+    p = argparse.ArgumentParser(description="add leafs without rebuilding the brain")
+    p.add_argument("--db", default="", help="path to kb.lbug (default var/kb.lbug)")
+    p.add_argument("--json", action="store_true", help="read leaf JSON from stdin")
+    p.add_argument("--text", default="", help="leaf text")
+    p.add_argument("--root", default="info", choices=("facts", "info"))
+    p.add_argument("--source", default="")
+    p.add_argument("--confidence", default="confirmed")
+    p.add_argument("--source-rev", default="working-tree")
+    p.add_argument("--how", default="brain/add")
+    p.add_argument("--loc", default="")
+    p.add_argument("--type", default="reference", dest="type_")
+    args = p.parse_args(argv)
+
+    if args.json:
+        raw = sys.stdin.read()
+        if not raw.strip():
+            print("kb/add: empty stdin", file=sys.stderr)
+            return 2
+        leafs = _as_leafs(json.loads(raw))
+    else:
+        if not args.text or not args.source:
+            print("kb/add: --text and --source are required (or --json)", file=sys.stderr)
+            return 2
+        leafs = [{
+            "text": args.text,
+            "root": args.root,
+            "source": args.source,
+            "confidence": args.confidence,
+            "source_rev": args.source_rev,
+            "how": args.how,
+            "loc": args.loc or args.source,
+            "type": args.type_,
+        }]
+
+    for lf in leafs:
+        if not lf.get("text") or not lf.get("source"):
+            print("kb/add: each leaf needs text and source", file=sys.stderr)
+            return 2
+
+    _embed_missing(leafs)
+
+    from kblib import DB_PATH, VAR
+
+    dbpath = Path(args.db) if args.db else DB_PATH
+    dbpath.parent.mkdir(parents=True, exist_ok=True)
+    VAR.mkdir(exist_ok=True)
+    db, conn = connect(dbpath, read_only=False)
+    init_schema(conn)
+    ids = add_leafs(conn, leafs)
+    ensure_indexes(conn)
+    conn.close()
+    db.close()
+    print(json.dumps({"mode": "add", "ids": ids, "db": str(dbpath)}))
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main(sys.argv[1:]))

bin/kb/index

@@ -2,12 +2,15 @@
 """kb/index - build the 2dph brain from markdown + factual leafs.
 
   bin/kb/index [--corpus DIR] [--rebuild] [--limit N]
+  bin/kb/index --rebuild --with-facts --with-chats
   bin/kb/index --json                 # emit stats as JSON
 
 Reads every .md under the corpus (default: repo root docs, skills, READMEs)
 as `info` leafs, embeds them with model2vec (potion-multilingual-128M), and
 writes them into var/kb.lbug with FTS + HNSW indexes. `facts` leafs come
-from bin/facts/extract (docker x compose x ssh-config pairing).
+from bin/facts/extract (docker × compose × ssh-config pairing) when
+`--with-facts` is set. `--with-chats` indexes markdown under var/chats/md
+(or a given dir) as info. WhatsApp sync stays out of v1.
 
 --rebuild drops the database file and indexes from scratch. Without it a run
 is idempotent (MERGE by (source,text) id).
@@ -22,7 +25,7 @@ ROOT = Path(__file__).resolve().parents[2]
 sys.path.insert(0, str(ROOT / "bin" / "tools"))
 
 from kblib import (  # noqa: E402
-    connect, ensure_indexes, init_schema, upsert_leaf,
+    add_leafs, connect, ensure_indexes, init_schema, upsert_leaf, link_from_file,
     open_readonly, stats,
 )
 from mdleaves import read_markdown, to_all, walk_markdown  # noqa: E402
@@ -81,10 +84,11 @@ def index_leafs(conn, leafs: list[dict], embed_fn, limit: int) -> tuple[int, int
     for lf in leafs[:limit] if limit else leafs:
         query = f"{lf['heading']}\n\n{lf['text']}"
         emb = embed_fn(lf["text"]) if lf["text"] else None
-        upsert_leaf(conn, text=query, root="info", confidence="confirmed",
+        lid = upsert_leaf(conn, text=query, root="info", confidence="confirmed",
                     source=lf["source"], source_rev="working-tree",
                     how="kb/index", loc=lf["source"], type_=lf.get("type", "reference"),
                     embedding=emb)
+        link_from_file(conn, lid, lf["source"], repo=str(lf.get("repo") or ""))
         count += 1
     return count, len(leafs)
 
@@ -95,12 +99,65 @@ def embedder():
     return lambda text: model.encode([text])[0].astype(float).tolist()
 
 
+def index_fact_dicts(conn, facts: list[dict], embed_fn) -> int:
+    """Write extract-shaped dicts as root=facts leafs (2-source source field)."""
+    leafs = []
+    for f in facts:
+        text = str(f.get("text") or "")
+        source = str(f.get("source") or "")
+        if not text or not source:
+            continue
+        leafs.append({
+            "text": text,
+            "root": "facts",
+            "confidence": "confirmed",
+            "source": source,
+            "source_rev": f.get("source_rev") or "working-tree",
+            "how": f.get("how") or "facts/extract",
+            "loc": f.get("loc") or source,
+            "type": "fact",
+            "embedding": embed_fn(text) if text else None,
+        })
+    return len(add_leafs(conn, leafs))
+
+
+def facts_from_extract() -> list[dict]:
+    import subprocess
+    proc = subprocess.run(
+        [sys.executable, str(ROOT / "bin" / "facts" / "extract"), "--json", "--dry-run"],
+        cwd=ROOT,
+        capture_output=True,
+        text=True,
+        check=False,
+    )
+    if proc.returncode != 0:
+        print(f"kb/index: facts/extract failed: {proc.stderr}", file=sys.stderr)
+        return []
+    try:
+        payload = json.loads(proc.stdout)
+    except json.JSONDecodeError:
+        print("kb/index: facts/extract produced non-JSON", file=sys.stderr)
+        return []
+    return list(payload.get("facts") or [])
+
+
 def main(argv: list[str]) -> int:
     import argparse
     p = argparse.ArgumentParser(description="build the 2dph brain index")
     p.add_argument("--corpus", action="append", help="extra markdown dir/file to index (may repeat)")
     p.add_argument("--rebuild", action="store_true", help="fresh db + indexes")
+    p.add_argument("--db", default="", help="path to kb.lbug (default var/kb.lbug)")
+    p.add_argument("--no-defaults", action="store_true", help="do not index repo README/docs/skills")
     p.add_argument("--with-mail", action="store_true", help="include var/mail message.md leafs")
+    p.add_argument("--with-facts", action="store_true", help="run facts/extract into root=facts")
+    p.add_argument("--facts-json", default="", help="JSON list (or {facts:[...]}) of fact dicts")
+    p.add_argument(
+        "--with-chats",
+        nargs="?",
+        const=str(ROOT / "var" / "chats" / "md"),
+        default="",
+        help="index chat markdown as info (default var/chats/md)",
+    )
     p.add_argument("--since", default="", help="with --with-mail, only messages dated >= YYYY-MM-DD")
     p.add_argument("--dry-run", action="store_true", help="count leafs, write nothing")
     p.add_argument(
@@ -114,44 +171,71 @@ def main(argv: list[str]) -> int:
 
     from kblib import DB_PATH, VAR
 
-    leafs = load_corpus(ROOT)
+    dbpath = Path(a.db) if a.db else DB_PATH
+    leafs: list[dict] = [] if a.no_defaults else load_corpus(ROOT)
     if a.corpus:
         for source in a.corpus:
             leafs.extend(load_corpus_glob(source))
+    chat_n = 0
+    if a.with_chats:
+        chats = load_corpus_glob(a.with_chats)
+        chat_n = len(chats)
+        leafs.extend(chats)
     mail_n = 0
     if a.with_mail:
         mail = from_mail_root(ROOT / "var" / "mail", since=a.since)
         mail_n = len(mail)
         leafs.extend(mail)
 
+    facts: list[dict] = []
+    if a.facts_json:
+        raw = Path(a.facts_json).read_text(encoding="utf-8")
+        payload = json.loads(raw)
+        facts = list(payload.get("facts") if isinstance(payload, dict) else payload)
+    if a.with_facts:
+        facts.extend(facts_from_extract())
+
     if a.dry_run:
-        msg = {"indexed": 0, "corpus_total": len(leafs), "mail_leafs": mail_n, "dry_run": True}
+        msg = {
+            "indexed": 0,
+            "corpus_total": len(leafs),
+            "mail_leafs": mail_n,
+            "chat_leafs": chat_n,
+            "facts_leafs": len(facts),
+            "dry_run": True,
+        }
         print(json.dumps(msg, indent=2) if a.json else
-              f"brain/index: {len(leafs)} leafs would be indexed (mail={mail_n})")
+              f"brain/index: {len(leafs)} info + {len(facts)} facts would be indexed")
         return 0
 
     VAR.mkdir(exist_ok=True)
-    if a.rebuild and DB_PATH.exists():
-        DB_PATH.unlink()
+    dbpath.parent.mkdir(parents=True, exist_ok=True)
+    if a.rebuild and dbpath.exists():
+        dbpath.unlink()
 
-    db, conn = connect(DB_PATH, read_only=False)
+    db, conn = connect(dbpath, read_only=False)
     init_schema(conn)
 
-    # Never DROP FTS/VECTOR (ghost catalog). Write leafs, then ensure indexes
-    # unless --skip-indexes (seed facts first — MERGE under live FTS corrupts it).
-    # --rebuild already deleted kb.lbug above, so CREATE runs on a clean DB.
     embed = embedder()
     done, total = index_leafs(conn, leafs, embed, a.limit)
+    fact_n = index_fact_dicts(conn, facts, embed) if facts else 0
     if not a.skip_indexes:
         ensure_indexes(conn)
     s = stats(conn)
     conn.close()
     db.close()
 
-    result = {"indexed": done, "corpus_total": total, **{k: v for k, v in s.items() if k in ("total", "by_root")}}
+    result = {
+        "indexed": done,
+        "corpus_total": total,
+        "facts_leafs": fact_n,
+        "chat_leafs": chat_n,
+        **{k: v for k, v in s.items() if k in ("total", "by_root")},
+    }
     if a.skip_indexes:
         result["indexes"] = "skipped"
-    print(json.dumps(result, indent=2) if a.json else f"indexed {done}/{total} leafs; db total {s['total']}")
+    print(json.dumps(result, indent=2) if a.json else
+          f"indexed {done}/{total} info + {fact_n} facts; db total {s['total']}")
     return 0
 
 

bin/kb/search

@@ -1,10 +1,9 @@
 #!/usr/bin/env bash
 # bin/kb/search — deprecated wrapper. Use bin/brain/search.go.
-# Sets CGO for ladybug, builds a binary (embed daemon needs a real executable),
-# then execs it. Prints one deprecation line.
+# CGO via Zig (bin/cgo/zig), not gcc. Builds a binary then execs it.
 set -euo pipefail
 
-ROOT="$(cd "$(dirname "$0")/../.." && pwd)"
+ROOT="$(CDPATH= cd -- "$(dirname "$0")/../.." && pwd)"
 BIN="$ROOT/var/bin/brain-search"
 SRC="$ROOT/internal/brain"
 CMD="$ROOT/bin/brain"
@@ -24,11 +23,10 @@ else
 fi
 
 if [ "$need_build" -eq 1 ]; then
-	echo "Building brain/search..." >&2
+	echo "Building brain/search (zig cc)..." >&2
 	(
 		cd "$ROOT" &&
-			CGO_CFLAGS="-I$ROOT/lib-ladybug" \
-			CGO_LDFLAGS="-L$ROOT/lib-ladybug -Wl,-rpath,$ROOT/lib-ladybug" \
+			eval "$("$ROOT/bin/cgo/zig" env)" &&
 			go build -tags system_ladybug -o "$BIN" ./bin/brain
 	) || exit 1
 fi

bin/mail/import

@@ -7,7 +7,7 @@
   bin/mail/import --since 2026-01-01    only messages after a date
   bin/mail/import --limit 50            cap messages per run
   bin/mail/import --no-attachments      body only, skip attachment conversion
-  bin/mail/import --ocr                OCR scanned PDFs/images via docling
+  bin/mail/import --ocr                OCR images (PDFs OCR when textless)
   bin/mail/import --dry-run            list messages without writing anything
 
 Writes one directory per message: var/mail/{folder}/{message_id}/
@@ -16,10 +16,11 @@ Writes one directory per message: var/mail/{folder}/{message_id}/
   attachments/*.md          converted attachment content
 
 Indexing is a separate step (`bin/brain/index.go --rebuild`): conversion can
-crash in native docling and must not leave the brain DB mid-transaction.
+crash and must not leave the brain DB mid-transaction.
 
-Requires ONLYOFFICE_URL/USER/PASS in .env (or env). Idempotent: a message
-already present (message.md exists) is skipped unless --force.
+Requires ONLYOFFICE_URL/USER/PASS in .env (or env) except `--from-raw`.
+Idempotent: a message already present (message.md exists) is skipped unless
+--force.
 """
 from __future__ import annotations
 
@@ -41,10 +42,10 @@ from mailconv import (  # noqa: E402
     IMAGE_SUFFIXES,
     LEGACY_OFFICE_SUFFIXES,
     TEXT_SUFFIXES,
+    convert_pdf,
     html_to_markdown,
-    is_convertible,
     normalize_markdown,
-    subject_to_filename,
+    ocr_image,
     zip_extract_safe,
 )
 
@@ -147,9 +148,9 @@ def convert_file_to_md(path: Path, ocr: bool) -> str | None:
         except Exception as e:
             return f"\n<!-- conversion failed: {e} -->\n"
     if suffix == ".pdf":
-        return _convert_pdf(path, ocr)
+        return convert_pdf(path, ocr)
     if suffix in IMAGE_SUFFIXES and ocr:
-        return _convert_pdf(path, ocr)
+        return ocr_image(path) or "\n<!-- ocr unavailable -->\n"
     if suffix in LEGACY_OFFICE_SUFFIXES:
         return _convert_legacy(path)
     if suffix in ARCHIVE_SUFFIXES:
@@ -157,67 +158,6 @@ def convert_file_to_md(path: Path, ocr: bool) -> str | None:
     return None
 
 
-def _convert_pdf(path: Path, ocr: bool) -> str:
-    """Convert one PDF to markdown.
-
-    Fast path: poppler's pdftotext (-layout) extracts exact text from
-    born-digital PDFs in ~15ms vs docling's 1-3s. Only textless PDFs (scanned
-    pages, layout-heavy) fall back to docling, which runs isolated in a
-    subprocess because its native onnx/RT-DETR has segfaulted the main process.
-    """
-    text = _pdf_fast_text(path)
-    if ocr or text is None or not text.strip():
-        return _convert_pdf_docling(path, ocr)
-    return normalize_markdown(text)
-
-
-def _pdf_fast_text(path: Path) -> str | None:
-    """pdftotext -layout; None when poppler is unavailable (or the PDF has no text layer)."""
-    try:
-        proc = subprocess.run(
-            ["pdftotext", "-layout", str(path), "-"],
-            capture_output=True, timeout=60)
-    except (OSError, subprocess.TimeoutExpired):
-        return None
-    if proc.returncode != 0:
-        return None
-    return proc.stdout.decode("utf-8", errors="replace")
-
-
-def _convert_pdf_docling(path: Path, ocr: bool) -> str:
-    try:
-        proc = subprocess.run(
-            [sys.executable, os.path.abspath(__file__), "--pdf-worker", str(path),
-             "--ocr" if ocr else "--no-ocr"],
-            capture_output=True, text=True, timeout=600)
-    except subprocess.TimeoutExpired:
-        return "\n<!-- pdf conversion timed out -->\n"
-    if proc.returncode != 0:
-        tail = proc.stderr.strip().splitlines()[-3:]
-        return f"\n<!-- pdf conversion failed: {proc.returncode}: {' | '.join(tail)} -->\n"
-    return proc.stdout
-
-
-def _pdf_worker(path: Path, ocr: bool) -> None:
-    """docling worker entry: prints converted markdown on stdout, exits non-zero on error."""
-    try:
-        from docling.document_converter import DocumentConverter, PdfFormatOption
-        from docling.datamodel.pipeline_options import PdfPipelineOptions
-        opts = PdfPipelineOptions()
-        opts.do_ocr = bool(ocr)
-        opts.do_table_structure = True
-        conv = DocumentConverter(format_options={"pdf": PdfFormatOption(pipeline_options=opts)})
-        res = conv.convert(str(path))
-        sys.stdout.write(normalize_markdown(res.document.export_to_markdown()))
-        sys.exit(0)
-    except Exception as e:
-        # errors/stacktraces to stderr; the caller only reports a one-liner
-        print(f"pdf-worker: {e}", file=sys.stderr)
-        import traceback
-        traceback.print_exc(file=sys.stderr)
-        sys.exit(1)
-
-
 def _convert_legacy(path: Path) -> str:
     """Legacy .doc/.xls/.ppt -> md via pandoc (installed) or a stub."""
     try:
@@ -356,19 +296,12 @@ def main(argv: list[str]) -> int:
     p.add_argument("--from-raw", default="",
                    help="convert Go-synced dirs (var/mail/<folder>/<id>/message.json) to markdown")
     p.add_argument("--no-attachments", action="store_true", help="skip attachment download+convert")
-    p.add_argument("--ocr", action="store_true", help="OCR scanned PDFs/images via docling")
+    p.add_argument("--ocr", action="store_true", help="OCR images (PDFs OCR when textless)")
     p.add_argument("--force", action="store_true", help="re-import even if message.md exists")
     p.add_argument("--dry-run", action="store_true", help="list messages, write nothing")
     p.add_argument("--json", action="store_true")
-    p.add_argument("--pdf-worker", default="", help=argparse.SUPPRESS)
-    p.add_argument("--no-ocr", action="store_true", help=argparse.SUPPRESS)
     a = p.parse_args(argv)
 
-    if a.pdf_worker:
-        _pdf_worker(Path(a.pdf_worker), ocr=not a.no_ocr)
-        return 0
-
-    conf = load_env()
     fid = folder_id(a.folder)
     out_root = ROOT / "var" / "mail"
     summary: list[dict] = []
@@ -394,6 +327,7 @@ def main(argv: list[str]) -> int:
                                      target_dir=msg_dir.parent))
             summary.append(entry)
     else:
+        conf = load_env()
         OOCLIENT = OOClient(conf)
         if a.id:
             messages = [{"id": i} for i in a.id]

bin/mail/ocr.go

@@ -0,0 +1,48 @@
+//usr/bin/env go run -tags=mail_ocr "$0" "$@"; exit
+//go:build mail_ocr
+//
+// bin/mail/ocr.go - OCR an image or scanned PDF (tesseract eng+deu).
+//
+//	./bin/mail/ocr.go scan.png
+//	./bin/mail/ocr.go scan.pdf
+//	OCR_ENGINE=paddle ./bin/mail/ocr.go scan.png
+//
+// PDFs try pdftotext -layout first; empty text layer uses pdftoppm + tesseract.
+// No gocv. Tesseract CGO bindings are not used (D21 Zig owns Ladybug CGO).
+// NOTE: never run `gofmt -w` on this file — it breaks the shebang.
+package main
+
+import (
+	"fmt"
+	"os"
+	"strings"
+
+	"github.com/eSlider/2dph/internal/ocr"
+)
+
+func main() {
+	os.Exit(run(os.Args[1:]))
+}
+
+func run(args []string) int {
+	if len(args) != 1 || strings.HasPrefix(args[0], "-") {
+		fmt.Fprintln(os.Stderr, `usage: bin/mail/ocr.go <image|pdf>`)
+		return 2
+	}
+	path := args[0]
+	var (
+		text string
+		err  error
+	)
+	if strings.HasSuffix(strings.ToLower(path), ".pdf") {
+		text, err = ocr.PDFFile(path)
+	} else {
+		text, err = ocr.ImageFile(path)
+	}
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "mail/ocr: %v\n", err)
+		return 1
+	}
+	fmt.Println(text)
+	return 0
+}

bin/markdown/import.go

@@ -1,20 +1,100 @@
-//usr/bin/env go run -tags=markdown_import "$0" "$@"; exit
-//go:build markdown_import
+//usr/bin/env go run "$0" "$@"; exit
 //
-// bin/markdown/import.go - split markdown into leafs (mistune).
+// bin/markdown/import.go - split markdown into leafs (H2 boundaries).
 //
 //	./bin/markdown/import.go [dir]
 //	./bin/markdown/import.go --files a.md,b.md --json
 //
+// Conversion only. Brain write is bin/brain/index.go.
+// Python bin/md/import remains as a fallback.
 // NOTE: never run `gofmt -w` on this file — it breaks the shebang.
 package main
 
 import (
+	"fmt"
 	"os"
+	"strings"
 
-	"github.com/eSlider/2dph/internal/cmdbin"
+	"github.com/eSlider/2dph/internal/mdleaves"
 )
 
 func main() {
-	os.Exit(cmdbin.ExecFile("bin/md/import", os.Args[1:]))
+	os.Exit(run(os.Args[1:]))
+}
+
+func run(args []string) int {
+	jsonOut := false
+	files := ""
+	root := "."
+	for i := 0; i < len(args); i++ {
+		a := args[i]
+		switch {
+		case a == "--json":
+			jsonOut = true
+		case a == "--files" && i+1 < len(args):
+			i++
+			files = args[i]
+		case strings.HasPrefix(a, "--files="):
+			files = strings.TrimPrefix(a, "--files=")
+		case a == "-h" || a == "--help":
+			fmt.Fprintln(os.Stderr, "bin/markdown/import.go [dir] [--files a.md,b.md] [--json]")
+			return 0
+		case strings.HasPrefix(a, "-"):
+			fmt.Fprintln(os.Stderr, "unknown arg:", a)
+			return 2
+		default:
+			root = a
+		}
+	}
+
+	var paths []string
+	if files != "" {
+		for _, f := range strings.Split(files, ",") {
+			f = strings.TrimSpace(f)
+			if f != "" {
+				paths = append(paths, f)
+			}
+		}
+	} else {
+		st, err := os.Stat(root)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "md/import: no such path %s\n", root)
+			return 2
+		}
+		if !st.IsDir() {
+			paths = []string{root}
+		} else {
+			var err error
+			paths, err = mdleaves.WalkMarkdown(root)
+			if err != nil {
+				fmt.Fprintf(os.Stderr, "md/import: %v\n", err)
+				return 1
+			}
+		}
+	}
+	if len(paths) == 0 {
+		fmt.Fprintln(os.Stderr, "md/import: no markdown files")
+		return 1
+	}
+
+	var all []mdleaves.Leaf
+	for _, p := range paths {
+		raw, err := os.ReadFile(p)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "md/import: %s: %v\n", p, err)
+			continue
+		}
+		all = append(all, mdleaves.ToAll(string(raw), p, "")...)
+	}
+	if jsonOut {
+		s, err := mdleaves.EncodeJSON(all)
+		if err != nil {
+			fmt.Fprintln(os.Stderr, err)
+			return 1
+		}
+		fmt.Print(s)
+		return 0
+	}
+	fmt.Print(mdleaves.EncodeYAML(all))
+	return 0
 }

bin/qa/stats.go

@@ -0,0 +1,73 @@
+//usr/bin/env go run -tags=qa_stats "$0" "$@"; exit
+//go:build qa_stats
+//
+// bin/qa/stats.go - DuckDB quantiles over a JSON number array or JSONL count.
+//
+//	./bin/qa/stats.go <<< '[1,2,3,4,5]'
+//	./bin/qa/stats.go --jsonl rows.jsonl
+//
+// NOTE: never run `gofmt -w` on this file — it breaks the shebang.
+// DuckDB CGO needs gcc/g++ (not Zig). After eval "$(bin/cgo/zig env)":
+//   CC=gcc CXX=g++ CGO_CFLAGS= CGO_LDFLAGS= ./bin/qa/stats.go
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"os"
+	"strings"
+
+	"github.com/eSlider/2dph/internal/duckstats"
+)
+
+func main() {
+	os.Exit(run(os.Args[1:]))
+}
+
+func run(args []string) int {
+	jsonl := ""
+	for i := 0; i < len(args); i++ {
+		a := args[i]
+		switch {
+		case a == "--jsonl" && i+1 < len(args):
+			i++
+			jsonl = args[i]
+		case strings.HasPrefix(a, "--jsonl="):
+			jsonl = strings.TrimPrefix(a, "--jsonl=")
+		case a == "-h" || a == "--help":
+			fmt.Fprintln(os.Stderr, "bin/qa/stats.go [--jsonl FILE]  # stdin = JSON [float,…]")
+			return 0
+		default:
+			fmt.Fprintln(os.Stderr, "unknown arg:", a)
+			return 2
+		}
+	}
+	if jsonl != "" {
+		n, err := duckstats.CountJSONL(jsonl)
+		if err != nil {
+			fmt.Fprintln(os.Stderr, err)
+			return 1
+		}
+		fmt.Printf("n: %d\n", n)
+		return 0
+	}
+	raw, err := io.ReadAll(os.Stdin)
+	if err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		return 1
+	}
+	var samples []float64
+	if err := json.Unmarshal(raw, &samples); err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		return 1
+	}
+	s, err := duckstats.Quantiles(samples)
+	if err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		return 1
+	}
+	fmt.Printf("n: %d\nmin: %g\np50: %g\np95: %g\nmax: %g\navg: %g\n",
+		s.N, s.Min, s.P50, s.P95, s.Max, s.Avg)
+	return 0
+}

bin/reasoner/bakeoff.go

@@ -0,0 +1,102 @@
+//usr/bin/env go run -tags=reasoner_bakeoff "$0" "$@"; exit
+//go:build reasoner_bakeoff
+//
+// bin/reasoner/bakeoff.go - CPU tool-call bake-off against an OpenAI-compatible URL (D18).
+//
+//	REASONER_BASE_URL=http://127.0.0.1:11435/v1 REASONER_MODEL=qwen3.5:9b ./bin/reasoner/bakeoff.go
+//	./bin/reasoner/bakeoff.go --model MichelRosselli/bonsai-27b:Q1_0 --json
+//
+// Measures OpenAI tool_calls (search/get/audit) and RSS from Ollama /api/ps, not VRAM.
+// PicoClaw is compose profile picoclaw; tool names match internal/httpapi MCP ops.
+// NOTE: never run `gofmt -w` on this file — it breaks the shebang.
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"strings"
+
+	"github.com/eSlider/2dph/internal/duckstats"
+	"github.com/eSlider/2dph/internal/reasoner"
+)
+
+func main() {
+	os.Exit(run(os.Args[1:]))
+}
+
+func run(args []string) int {
+	base := os.Getenv("REASONER_BASE_URL")
+	if base == "" {
+		base = "http://127.0.0.1:11435/v1"
+	}
+	model := os.Getenv("REASONER_MODEL")
+	if model == "" {
+		model = reasoner.OllamaRAM
+	}
+	jsonOut := false
+	device := "cpu"
+	for i := 0; i < len(args); i++ {
+		a := args[i]
+		switch {
+		case a == "--json":
+			jsonOut = true
+		case a == "--model" && i+1 < len(args):
+			i++
+			model = args[i]
+		case strings.HasPrefix(a, "--model="):
+			model = strings.TrimPrefix(a, "--model=")
+		case a == "--base-url" && i+1 < len(args):
+			i++
+			base = args[i]
+		case a == "--device" && i+1 < len(args):
+			i++
+			device = args[i]
+		case a == "-h" || a == "--help":
+			fmt.Fprintln(os.Stderr, "bin/reasoner/bakeoff.go [--model ID] [--base-url URL] [--device cpu] [--json]")
+			return 0
+		default:
+			fmt.Fprintln(os.Stderr, "unknown arg:", a)
+			return 2
+		}
+	}
+	c := reasoner.Client{BaseURL: base, Model: model, Device: device}
+	rep := reasoner.Run(c)
+	lat := make([]float64, 0, len(rep.Prompts))
+	for _, p := range rep.Prompts {
+		lat = append(lat, float64(p.LatencyMS))
+	}
+	if st, err := duckstats.Quantiles(lat); err == nil {
+		rep.LatencyP50MS = st.P50
+		rep.LatencyP95MS = st.P95
+	}
+	raw, err := json.MarshalIndent(rep, "", "  ")
+	if err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		return 1
+	}
+	if jsonOut {
+		fmt.Println(string(raw))
+	} else {
+		fmt.Printf("model: %s\n", rep.Model)
+		fmt.Printf("hf_id: %s\n", rep.HF)
+		fmt.Printf("device: %s\n", rep.Device)
+		fmt.Printf("tool_call: %d/%d\n", rep.ToolCallOK, rep.ToolCallN)
+		fmt.Printf("xml_leak: %d\n", rep.XMLLeak)
+		fmt.Printf("rss_mb: %d\n", rep.RSSMB)
+		fmt.Printf("vram_mb: %d\n", rep.VRAMMB)
+		fmt.Printf("latency_p50_ms: %g\n", rep.LatencyP50MS)
+		fmt.Printf("latency_p95_ms: %g\n", rep.LatencyP95MS)
+		for _, p := range rep.Prompts {
+			status := "fail"
+			if p.OK {
+				status = "ok"
+			}
+			fmt.Printf("  %s: %s wanted=%s got=%s xml=%v %dms %s\n", p.WantedTool, status, p.WantedTool, p.ToolName, p.XMLLeak, p.LatencyMS, p.Err)
+		}
+	}
+	if rep.ToolCallN == 0 {
+		return 1
+	}
+	return 0
+}

bin/reasoner/doc.go

@@ -0,0 +1,2 @@
+// Commands in this directory are shebang mains (bakeoff.go).
+package main

bin/serve.go

@@ -18,5 +18,5 @@ func main() {
 			os.Setenv("KB_ROOT", wd)
 		}
 	}
-	httpapi.Run()
+	httpapi.Run(nil)
 }

bin/tools/gitimport.py

@@ -1,21 +1,12 @@
-"""gitimport - parse `git log` output and turn commits into brain leafs.
+"""gitimport - Ladybug graph writes for Commit/File/Person (no git binary).
 
-Pure, testable functions. Field grammar (see bin/git/import):
-
-  git log --no-merges --name-only \
-      --format='%x1e%H%x1f%an%x1f%ae%x1f%aI%x1f%s'
-
-  0x1e = record separator, 0x1f = field separator.
-  Files: newline-separated lines following each record's subject.
+Commit records come from bin/git/import.go (go-git). This module only MERGEs
+the version graph File-[:HAS_VERSION]->Commit-[:AUTHORED]->Person.
 """
-
 from __future__ import annotations
 
 from dataclasses import dataclass, field
 
-REC_SEP = "\x1e"
-FIELD_SEP = "\x1f"
-
 
 @dataclass
 class Commit:
@@ -26,54 +17,6 @@ class Commit:
     subject: str
     files: list[str] = field(default_factory=list)
 
-    def leaf_text(self, repo: str) -> str:
-        head = f"commit {self.sha[:12]} in {repo} — {self.subject}"
-        body = [head, f"Author: {self.author} <{self.email}>", f"Date: {self.date}"]
-        if self.files:
-            body.append("Changing: " + ", ".join(self.files))
-        return "\n".join(body)
-
-
-def parse_log(text: str) -> list[Commit]:
-    """Parse `git log` output into Commit records.
-
-    Records are separated by 0x1e. A record is fields joined by 0x1f,
-    followed by optional newline-separated file paths inside the next
-    segment (git emits blank line + files after each record).
-    """
-    commits: list[Commit] = []
-    # field records and file lists alternate; simpler: split on REC_SEP,
-    # each chunk = header line, possibly followed by newline + files.
-    for chunk in text.split(REC_SEP):
-        chunk = chunk.strip("\n")
-        if not chunk:
-            continue
-        lines = chunk.split("\n", 1)
-        header = lines[0].split(FIELD_SEP)
-        if len(header) < 5:
-            continue
-        sha, author, email, date, subject = header[:5]
-        files = [ln.strip() for ln in lines[1].splitlines() if ln.strip()] if len(lines) > 1 else []
-        commits.append(Commit(sha=sha, author=author, email=email,
-                              date=date, subject=subject, files=files))
-    return commits
-
-
-def commits_to_leafs(commits: list[Commit], repo: str) -> list[dict]:
-    """Map commits to the leaf shape bin/kb/index expects (source/repo/...)."""
-    out: list[dict] = []
-    for c in commits:
-        out.append({
-            "source": f"{repo}@{c.sha}",
-            "repo": repo,
-            "heading": f"commit {c.sha[:12]} — {c.subject}",
-            "text": c.leaf_text(repo),
-            "type": "commit",
-            "status": "current",
-            "related": ",".join(c.files),
-        })
-    return out
-
 
 GIT_SCHEMA = (
     "CREATE NODE TABLE IF NOT EXISTS Commit (id STRING, repo STRING, subject STRING, "
@@ -114,4 +57,4 @@ def index_commits(conn, commits: list[Commit], repo: str) -> int:
             conn.execute("MATCH (f:File {id:$fid}), (c:Commit {id:$sha}) "
                          "MERGE (f)-[:HAS_VERSION]->(c)",
                          parameters={"fid": f"{repo}:{path}", "sha": c.sha})
-    return len(commits)
+    return len(commits)

bin/tools/kblib.py

@@ -4,7 +4,7 @@ Single embedded graph `var/kb.lbug`. Two roots: facts (assertions backed by
 >=2 independent sources) and info (narrative leafs). Hybrid retrieval: BM25
 (FTS extension) + HNSW cosine (VECTOR extension) + Cypher graph hops.
 
-All access is read-only unless `--rebuild` is passed to kb/index.
+All access is read-only unless `--rebuild` (kb/index) or `kb/add`.
 """
 from __future__ import annotations
 
@@ -118,6 +118,97 @@ def upsert_leaf(conn: ladybug.Connection, *, text: str, root: str, confidence: s
     return lid
 
 
+def add_leafs(conn: ladybug.Connection, leafs: list[dict]) -> list[str]:
+    """Write facts+info leafs in one transaction. Safe while FTS/HNSW exist.
+
+    Each leaf dict: text, source, optional root/confidence/source_rev/how/loc/type/embedding.
+    Does not delete the database file. Measured on Ladybug 0.19: MERGE of new
+    ids (and updates) stays FTS+HNSW queryable; DROP INDEX is the fatal path.
+    """
+    if not leafs:
+        return []
+    started = False
+    try:
+        conn.execute("BEGIN TRANSACTION")
+        started = True
+    except Exception:
+        started = False
+    ids: list[str] = []
+    try:
+        for lf in leafs:
+            ids.append(
+                upsert_leaf(
+                    conn,
+                    text=str(lf["text"]),
+                    root=str(lf.get("root") or ROOT_INFO),
+                    confidence=str(lf.get("confidence") or CONF_CONFIRMED),
+                    source=str(lf["source"]),
+                    source_rev=str(lf.get("source_rev") or "working-tree"),
+                    how=str(lf.get("how") or "brain/add"),
+                    loc=str(lf.get("loc") or lf.get("source") or ""),
+                    type_=str(lf.get("type") or lf.get("type_") or "reference"),
+                    embedding=lf.get("embedding"),
+                )
+            )
+        if started:
+            conn.execute("COMMIT")
+    except Exception:
+        if started:
+            try:
+                conn.execute("ROLLBACK")
+            except Exception:
+                pass
+        raise
+    return ids
+
+
+def file_id(repo: str, path: str) -> str:
+    """Stable File.id matching gitimport (`repo:path`)."""
+    return f"{repo}:{path}" if repo else path
+
+
+def link_from_file(conn: ladybug.Connection, leaf_id: str, path: str,
+                   repo: str = "", mtime: str = "") -> str:
+    """MERGE File and Leaf-[:FROM_FILE]->File so --hop 1 can walk."""
+    fid = file_id(repo, path)
+    conn.execute(
+        "MERGE (f:File {id:$id}) SET f.path=$path, f.repo=$repo, f.mtime=$mtime",
+        parameters={"id": fid, "path": path, "repo": repo, "mtime": mtime},
+    )
+    conn.execute(
+        "MATCH (l:Leaf {id:$lid}), (f:File {id:$fid}) "
+        "MERGE (l)-[:FROM_FILE]->(f)",
+        parameters={"lid": leaf_id, "fid": fid},
+    )
+    return fid
+
+
+HOP_STMTS = {
+    1: "MATCH (l:Leaf {id:$id})-[:FROM_FILE]->(f:File) RETURN f.id, f.path, 1",
+    2: ("MATCH (l:Leaf {id:$id})-[:FROM_FILE]->(f:File)-[:HAS_VERSION]->(c:Commit) "
+        "RETURN c.id, c.subject, 2"),
+    3: ("MATCH (l:Leaf {id:$id})-[:FROM_FILE]->(f:File)-[:HAS_VERSION]->(c:Commit)"
+        "-[:AUTHORED]->(p:Person) RETURN p.id, p.name, 3"),
+}
+HOP_LABELS = {1: "File", 2: "Commit", 3: "Person"}
+
+
+def hop_walk(conn: ladybug.Connection, leaf_id: str, n: int) -> list[dict]:
+    """Walk Leaf → File → Commit → Person up to n hops (max 3)."""
+    depth = min(max(int(n), 0), 3)
+    out: list[dict] = []
+    for d in range(1, depth + 1):
+        rows = conn.execute(HOP_STMTS[d], parameters={"id": leaf_id}).get_all()
+        for row in rows:
+            out.append({
+                "id": row[0],
+                "label": HOP_LABELS[d],
+                "name": row[1],
+                "depth": int(row[2]),
+            })
+    return out
+
+
 def leaf_index_names(conn: ladybug.Connection) -> set[str]:
     """Return index names on the Leaf table (e.g. {'id', 'Leaf_vec', '_PK'})."""
     rows = conn.execute("CALL SHOW_INDEXES() RETURN *").get_all()

bin/tools/mailconv.py

@@ -7,7 +7,10 @@ offline against fixtures.
 from __future__ import annotations
 
 import html
+import os
 import re
+import subprocess
+import tempfile
 import zipfile
 from pathlib import Path
 
@@ -18,9 +21,10 @@ OFFICE_SUFFIXES = {".docx", ".pptx", ".xlsx", ".html", ".htm", ".epub", ".eml",
 PDF_SUFFIXES = {".pdf"}
 IMAGE_SUFFIXES = {".png", ".jpg", ".jpeg", ".gif", ".bmp", ".tiff", ".tif", ".webp"}
 ARCHIVE_SUFFIXES = {".zip"}
-# Legacy binary Office (doc/xls/ppt) — markitdown/docling skip them; we try
+# Legacy binary Office (doc/xls/ppt) — markitdown skip them; we try
 # pandoc first, else leave a stub.
 LEGACY_OFFICE_SUFFIXES = {".doc", ".xls", ".ppt"}
+TESS_LANG = "eng+deu"
 
 CONVERTIBLE_SUFFIXES = (
     TEXT_SUFFIXES | OFFICE_SUFFIXES | PDF_SUFFIXES | IMAGE_SUFFIXES | ARCHIVE_SUFFIXES | LEGACY_OFFICE_SUFFIXES
@@ -146,3 +150,82 @@ def zip_extract_safe(zip_path: Path, dest: Path) -> list[Path]:
 
 def is_convertible(suffix: str) -> bool:
     return suffix.lower() in CONVERTIBLE_SUFFIXES
+
+
+def convert_pdf(path: Path, ocr: bool = False) -> str:
+    """pdftotext -layout first; empty text layer → pdftoppm + tesseract.
+
+    `ocr` is unused for born-digital PDFs (text layer wins). Scans OCR
+    automatically. This path never execs an ONNX document converter.
+    """
+    del ocr  # scans OCR when the text layer is empty; flag is for images
+    text = pdf_fast_text(path)
+    if text and text.strip():
+        return normalize_markdown(text)
+    scanned = ocr_pdf(path)
+    if scanned and scanned.strip():
+        return normalize_markdown(scanned)
+    if text:
+        return normalize_markdown(text)
+    return "\n<!-- pdf has no text layer (ocr unavailable) -->\n"
+
+
+def pdf_fast_text(path: Path) -> str | None:
+    """pdftotext -layout; None when poppler is missing or the command fails."""
+    try:
+        proc = subprocess.run(
+            ["pdftotext", "-layout", str(path), "-"],
+            capture_output=True, timeout=60)
+    except (OSError, subprocess.TimeoutExpired):
+        return None
+    if proc.returncode != 0:
+        return None
+    return proc.stdout.decode("utf-8", errors="replace")
+
+
+def ocr_pdf(path: Path) -> str:
+    """Rasterize with pdftoppm and OCR each page (tesseract or paddle)."""
+    try:
+        with tempfile.TemporaryDirectory(prefix="2dph-ocr-") as tmp:
+            prefix = str(Path(tmp) / "page")
+            proc = subprocess.run(
+                ["pdftoppm", "-png", "-r", "200", str(path), prefix],
+                capture_output=True, timeout=120)
+            if proc.returncode != 0:
+                return ""
+            pages = sorted(Path(tmp).glob("page*.png"))
+            parts = [ocr_image(p) for p in pages]
+            return "\n\n".join(p for p in parts if p and p.strip())
+    except (OSError, subprocess.TimeoutExpired):
+        return ""
+
+
+def ocr_image(path: Path) -> str:
+    engine = os.environ.get("OCR_ENGINE", "tesseract")
+    if engine == "paddle":
+        return _ocr_paddle(path)
+    return _ocr_tesseract(path)
+
+
+def _ocr_tesseract(path: Path) -> str:
+    try:
+        proc = subprocess.run(
+            ["tesseract", str(path), "stdout", "-l", TESS_LANG, "--psm", "6"],
+            capture_output=True, timeout=120)
+    except (OSError, subprocess.TimeoutExpired):
+        return ""
+    if proc.returncode != 0:
+        return ""
+    return proc.stdout.decode("utf-8", errors="replace").strip()
+
+
+def _ocr_paddle(path: Path) -> str:
+    try:
+        proc = subprocess.run(
+            ["paddleocr", "ocr", "-i", str(path)],
+            capture_output=True, timeout=180)
+    except (OSError, subprocess.TimeoutExpired):
+        return ""
+    if proc.returncode != 0:
+        return ""
+    return proc.stdout.decode("utf-8", errors="replace").strip()

bin/tools/test_bin_layout.py

@@ -1,6 +1,7 @@
 """D14 layout: bin/{subject}/{method}.go, libs in internal/, one go.mod."""
 from __future__ import annotations
 
+import os
 import unittest
 from pathlib import Path
 
@@ -74,9 +75,58 @@ class BinLayoutTest(unittest.TestCase):
         )
 
     def test_brain_methods_are_shebangs(self) -> None:
-        for method in ("index.go", "get.go", "stats.go", "eval.go", "watch.go"):
+        for method in ("index.go", "add.go", "get.go", "stats.go", "eval.go", "watch.go"):
             self._assert_shebang(f"bin/brain/{method}")
 
+    def test_brain_add_is_python_write_not_rebuild(self) -> None:
+        self._assert_shebang("bin/brain/add.go")
+        text = (ROOT / "bin" / "brain" / "add.go").read_text()
+        self.assertIn("cmdbin.ExecFile", text)
+        self.assertIn("bin/kb/add", text)
+        self.assertNotIn("--rebuild", text)
+        py = (ROOT / "bin" / "kb" / "add").read_text()
+        self.assertIn("add_leafs", py)
+        self.assertIn("--json", py)
+        self.assertNotIn("unlink", py.lower())
+
+    def test_brain_get_stats_eval_are_not_python_exec(self) -> None:
+        for method in ("get.go", "stats.go", "eval.go"):
+            text = (ROOT / "bin" / "brain" / method).read_text()
+            self.assertNotIn(
+                "ExecFile",
+                text,
+                f"bin/brain/{method} must call internal/brain, not ExecFile Python",
+            )
+            self.assertNotIn(
+                "cmdbin",
+                text,
+                f"bin/brain/{method} must not import internal/cmdbin",
+            )
+            self.assertIn(
+                "system_ladybug",
+                text.splitlines()[0],
+                f"bin/brain/{method} shebang must pass -tags=system_ladybug",
+            )
+            self.assertIn(
+                "github.com/eSlider/2dph/internal/brain",
+                text,
+            )
+
+    def test_eval_control_questions_live_in_rank(self) -> None:
+        rank = (ROOT / "internal" / "brain" / "rank" / "evalq.go").read_text()
+        py = (ROOT / "bin" / "kb" / "eval").read_text()
+        for frag in ("BM25", "DevOps", "LadybugDB"):
+            self.assertIn(frag, rank)
+            self.assertIn(frag, py)
+        self.assertIn("0.95", rank)
+
+    def test_facts_methods_are_shebangs(self) -> None:
+        for method in ("audit.go", "extract.go", "crm.go"):
+            self._assert_shebang(f"bin/facts/{method}")
+            text = (ROOT / "bin" / "facts" / method).read_text()
+            self.assertIn("cmdbin.ExecFile", text)
+            self.assertIn(f"bin/facts/{method.removesuffix('.go')}", text)
+
     def test_mail_import_is_shebang_not_brain_write(self) -> None:
         self._assert_shebang("bin/mail/import.go")
         index_mail = (ROOT / "bin" / "mail" / "index_mail").read_text()
@@ -86,8 +136,149 @@ class BinLayoutTest(unittest.TestCase):
             "index_mail must point at bin/brain/index.go",
         )
 
-    def test_markdown_import_is_shebang(self) -> None:
+    def test_mail_ocr_is_tesseract_not_docling(self) -> None:
+        self._assert_shebang("bin/mail/ocr.go")
+        ocr = (ROOT / "bin" / "mail" / "ocr.go").read_text()
+        self.assertIn("internal/ocr", ocr)
+        self.assertIn("mail_ocr", ocr)
+        self.assertNotIn("github.com/otiai10/gosseract", ocr)
+        py = (ROOT / "bin" / "mail" / "import").read_text()
+        self.assertNotIn("from docling", py)
+        self.assertNotIn("import docling", py)
+        self.assertIn("convert_pdf", py)
+        conv = (ROOT / "bin" / "tools" / "mailconv.py").read_text()
+        self.assertIn("pdftotext", conv)
+        self.assertIn("pdftoppm", conv)
+        self.assertIn("tesseract", conv)
+        self.assertIn("eng+deu", conv)
+        self.assertNotIn("from docling", conv)
+        self.assertNotIn("import docling", conv)
+        self.assertNotIn("gocv", conv.lower())
+        proj = (ROOT / "pyproject.toml").read_text()
+        self.assertNotIn("docling", proj)
+        ci = (ROOT / ".github" / "workflows" / "ci.yml").read_text()
+        self.assertIn("tesseract-ocr", ci)
+        self.assertIn("./internal/ocr", ci)
+        compose = (ROOT / "compose.yaml").read_text()
+        self.assertIn("ocr-paddle", compose)
+        self.assertIn("OCR_ENGINE", compose)
+
+    def test_markdown_import_is_go_not_python_exec(self) -> None:
         self._assert_shebang("bin/markdown/import.go")
+        text = (ROOT / "bin" / "markdown" / "import.go").read_text()
+        self.assertNotIn("ExecFile", text)
+        self.assertNotIn("cmdbin", text)
+        self.assertIn("internal/mdleaves", text)
+        self.assertNotIn("kb.lbug", text)
+
+    def test_import_adapters_do_not_write_ladybug(self) -> None:
+        for rel in (
+            "bin/mail/import.go",
+            "bin/mail/import",
+            "bin/markdown/import.go",
+            "bin/chats/import.go",
+            "bin/git/import.go",
+        ):
+            text = (ROOT / rel).read_text()
+            self.assertNotIn("upsert_leaf", text, rel)
+            self.assertNotIn("kb.lbug", text, rel)
+            self.assertNotIn("var/brain.lbug", text, rel)
+        index = (ROOT / "bin" / "brain" / "index.go").read_text()
+        self.assertIn("bin/kb/index", index)
 
     def test_postgres_query_is_shebang(self) -> None:
         self._assert_shebang("bin/postgres/query.go")
+
+    def test_git_import_is_gogit_shebang(self) -> None:
+        self._assert_shebang("bin/git/import.go")
+        py = (ROOT / "bin" / "git" / "import").read_text()
+        self.assertNotIn(
+            '["git"',
+            py,
+            "Python git/import must not subprocess the git binary",
+        )
+        self.assertIn("bin/git/import.go", py)
+
+    def test_web_search_is_shebang(self) -> None:
+        self._assert_shebang("bin/web/search.go")
+        py = (ROOT / "bin" / "web" / "search").read_text()
+        self.assertIn("bin/web/search.go", py)
+
+    def test_gitimport_py_has_no_git_binary(self) -> None:
+        py = (ROOT / "bin" / "tools" / "gitimport.py").read_text()
+        self.assertNotIn("subprocess", py)
+        self.assertNotIn("git log", py)
+
+    def test_gogit_is_direct_go_mod_require(self) -> None:
+        text = (ROOT / "go.mod").read_text()
+        first = text.split("require (")[1].split(")")[0]
+        self.assertRegex(first, r"github.com/go-git/go-git/v5\s+v")
+        for line in first.splitlines():
+            if "go-git/go-git" in line:
+                self.assertNotIn("indirect", line)
+
+    def test_duckdb_go_is_direct_require(self) -> None:
+        text = (ROOT / "go.mod").read_text()
+        first = text.split("require (")[1].split(")")[0]
+        self.assertRegex(first, r"github.com/duckdb/duckdb-go/v2\s+v")
+        for line in first.splitlines():
+            if "duckdb/duckdb-go" in line:
+                self.assertNotIn("indirect", line)
+        skill = (ROOT / "skills" / "duckdb" / "SKILL.md").read_text()
+        self.assertIn("github.com/duckdb/duckdb-go", skill)
+        self.assertIn("Ladybug", skill)
+        self.assertIn("sqlite", skill.lower())
+        self.assertIn("gcc", skill.lower())
+        self.assertIn("Zig", skill)
+        plan = (ROOT / "PLAN.md").read_text()
+        self.assertIn("D22", plan)
+        self.assertIn("duckdb-go", plan)
+        self._assert_shebang("bin/qa/stats.go")
+        reasoner = (ROOT / "internal" / "reasoner" / "client.go").read_text()
+        self.assertNotIn("duckdb", reasoner)
+        self.assertNotIn("duckstats", reasoner)
+        bakeoff = (ROOT / "bin" / "reasoner" / "bakeoff.go").read_text()
+        self.assertIn("internal/duckstats", bakeoff)
+        webcache = (ROOT / "internal" / "websearch" / "cache.go").read_text()
+        self.assertNotIn("duckdb", webcache)
+        self.assertIn("modernc.org/sqlite", webcache)
+
+    def test_cgo_uses_zig_not_gcc(self) -> None:
+        for rel in ("bin/cgo/zig", "bin/cgo/zcc", "bin/cgo/zc++"):
+            p = ROOT / rel
+            self.assertTrue(p.is_file(), f"missing {rel}")
+            self.assertTrue(
+                os.access(p, os.X_OK),
+                f"{rel} must be executable",
+            )
+        zig = (ROOT / "bin" / "cgo" / "zig").read_text()
+        self.assertIn("zig cc", zig)
+        self.assertIn("0.14.1", zig)
+        zcc = (ROOT / "bin" / "cgo" / "zcc").read_text()
+        self.assertIn('exec "$ZIG" cc', zcc)
+        self.assertNotIn("command -v gcc", zcc)
+        search = (ROOT / "bin" / "kb" / "search").read_text()
+        self.assertIn("bin/cgo/zig", search)
+        self.assertNotIn("command -v gcc", search)
+
+    def test_ci_recall_sot_is_zig_brain_eval(self) -> None:
+        ci = (ROOT / ".github" / "workflows" / "ci.yml").read_text()
+        self.assertIn("bin/brain/eval.go", ci)
+        self.assertIn("system_ladybug,brain_eval", ci)
+        self.assertIn("/tmp/brain-eval", ci)
+        self.assertIn("KB_ROOT", ci)
+        self.assertNotIn("bin/kb/eval", ci)
+        self.assertNotIn("gate skipped", ci)
+        self.assertIn("./bin/facts/audit self", ci)
+
+    def test_eval_fragments_live_in_default_corpus(self) -> None:
+        """CI --rebuild indexes README/PLAN/docs/skills; fragments must be there."""
+        corpus = []
+        for rel in ("README.md", "PLAN.md", "AGENTS.md"):
+            corpus.append((ROOT / rel).read_text())
+        for d in ("docs", "skills"):
+            for p in (ROOT / d).rglob("*.md"):
+                corpus.append(p.read_text())
+        blob = "\n".join(corpus)
+        for frag in ("BM25", "DevOps", "LadybugDB"):
+            self.assertIn(frag, blob, f"{frag} must appear in default index corpus")

bin/tools/test_gitgraph.py

@@ -9,12 +9,6 @@ sys.path.insert(0, str(Path(__file__).resolve().parent))
 import kblib  # noqa: E402
 import gitimport  # noqa: E402
 
-SAMPLE = (
-    "\x1e" + "a1b2c3d" + "\x1f" + "Ada Lovelace" + "\x1f" + "ada@example.com"
-    + "\x1f" + "2026-08-10T12:00:00+01:00" + "\x1f" + "feat: first commit"
-    + "\n\nREADME.md\nsrc/main.c\n"
-)
-
 COMMIT_PERSON_SCHEMA = (
     "CREATE NODE TABLE IF NOT EXISTS Commit (id STRING, repo STRING, subject STRING, "
     "author STRING, email STRING, date STRING, PRIMARY KEY(id))"
@@ -26,6 +20,17 @@ HAS_VERSION_SCHEMA = "CREATE REL TABLE IF NOT EXISTS HAS_VERSION (FROM File TO C
 AUTHORED_SCHEMA = "CREATE REL TABLE IF NOT EXISTS AUTHORED (FROM Commit TO Person)"
 
 
+def sample_commit() -> gitimport.Commit:
+    return gitimport.Commit(
+        sha="a1b2c3d",
+        author="Ada Lovelace",
+        email="ada@example.com",
+        date="2026-08-10T12:00:00+01:00",
+        subject="feat: first commit",
+        files=["README.md", "src/main.c"],
+    )
+
+
 class GitGraphTest(unittest.TestCase):
     def setUp(self):
         self.dir = tempfile.mkdtemp()
@@ -42,14 +47,12 @@ class GitGraphTest(unittest.TestCase):
         self.db.close()
 
     def test_index_commits_creates_nodes_and_edges(self):
-        cs = gitimport.parse_log(SAMPLE)
-        gitimport.index_commits(self.conn, cs, "sample-repo")
+        gitimport.index_commits(self.conn, [sample_commit()], "sample-repo")
         rp = self.conn.execute("MATCH (p:Person) RETURN p.name, p.email").get_all()
         self.assertEqual([tuple(r) for r in rp], [("Ada Lovelace", "ada@example.com")])
         rc = self.conn.execute("MATCH (c:Commit) RETURN c.id, c.repo").get_all()
         self.assertEqual(len(rc), 1)
         self.assertEqual(rc[0][1], "sample-repo")
-        # File -[:HAS_VERSION]-> Commit -[:AUTHORED]-> Person
         rf = self.conn.execute(
             "MATCH (f:File)-[:HAS_VERSION]->(c:Commit)-[:AUTHORED]->(p:Person) "
             "RETURN f.path, c.id, p.email").get_all()
@@ -58,7 +61,7 @@ class GitGraphTest(unittest.TestCase):
         self.assertTrue(all(r[2] == "ada@example.com" for r in rf))
 
     def test_index_commits_idempotent(self):
-        cs = gitimport.parse_log(SAMPLE)
+        cs = [sample_commit()]
         gitimport.index_commits(self.conn, cs, "sample-repo")
         gitimport.index_commits(self.conn, cs, "sample-repo")
         n = self.conn.execute("MATCH (c:Commit) RETURN count(*)").get_all()[0][0]
@@ -68,4 +71,4 @@ class GitGraphTest(unittest.TestCase):
 
 
 if __name__ == "__main__":
-    unittest.main()
+    unittest.main()

bin/tools/test_gitimport.py

@@ -1,57 +0,0 @@
-import sys
-import unittest
-from pathlib import Path
-
-sys.path.insert(0, str(Path(__file__).resolve().parent))
-
-import gitimport  # noqa: E402
-
-SAMPLE = (
-    "\x1e" + "a1b2c3d" + "\x1f" + "Ada Lovelace" + "\x1f" + "ada@example.com"
-    + "\x1f" + "2026-08-10T12:00:00+01:00" + "\x1f" + "feat: first commit"
-    + "\n\nREADME.md\nsrc/main.c\n"
-    + "\x1e" + "e4f5a6b" + "\x1f" + "Bob Babbage" + "\x1f" + "bob@example.com"
-    + "\x1f" + "2026-08-11T09:30:00+01:00" + "\x1f" + "fix: typo"
-    + "\n\ndocs/notes.md"
-)
-
-
-class GitparseTest(unittest.TestCase):
-    def test_parses_records(self):
-        cs = gitimport.parse_log(SAMPLE)
-        self.assertEqual(len(cs), 2)
-
-    def test_parses_commit_fields(self):
-        cs = gitimport.parse_log(SAMPLE)
-        c = cs[0]
-        self.assertEqual(c.sha, "a1b2c3d")
-        self.assertEqual(c.author, "Ada Lovelace")
-        self.assertEqual(c.email, "ada@example.com")
-        self.assertEqual(c.date, "2026-08-10T12:00:00+01:00")
-        self.assertEqual(c.subject, "feat: first commit")
-
-    def test_parses_changed_files(self):
-        cs = gitimport.parse_log(SAMPLE)
-        self.assertEqual(cs[0].files, ["README.md", "src/main.c"])
-        self.assertEqual(cs[1].files, ["docs/notes.md"])
-
-    def test_ignores_empty(self):
-        self.assertEqual(gitimport.parse_log(""), [])
-
-    def test_skip_malformed_record(self):
-        self.assertEqual(gitimport.parse_log("\x1eweird\x1e"), [])
-
-    def test_commit_leaf_shape(self):
-        leafs = gitimport.commits_to_leafs(gitimport.parse_log(SAMPLE), "sample-repo")
-        self.assertEqual(len(leafs), 2)
-        lf = leafs[0]
-        self.assertEqual(lf["type"], "commit")
-        self.assertEqual(lf["repo"], "sample-repo")
-        self.assertEqual(lf["source"], "sample-repo@a1b2c3d")
-        self.assertIn("Ada Lovelace", lf["text"])
-        self.assertIn("README.md", lf["related"])
-        self.assertIn("feat: first commit", lf["heading"])
-
-
-if __name__ == "__main__":
-    unittest.main()

bin/tools/test_index_adapters.py

@@ -0,0 +1,97 @@
+"""Import adapters write files only. Index rebuild is brain/index (D14 / Gitea #7)."""
+from __future__ import annotations
+
+import json
+import os
+import subprocess
+import sys
+import tempfile
+import unittest
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[2]
+
+
+class IndexAdapterTest(unittest.TestCase):
+    def test_dry_run_fixture_corpus_does_not_write_lbug(self) -> None:
+        tmp = Path(tempfile.mkdtemp())
+        (tmp / "note.md").write_text("# Fixture\n\n## Leaf\n\nhello corpus\n", encoding="utf-8")
+        lbug = tmp / "kb.lbug"
+        try:
+            import ladybug  # noqa: F401
+        except ImportError:
+            venv_py = ROOT / ".venv" / "bin" / "python"
+            if not venv_py.is_file():
+                self.skipTest("ladybug missing")
+            py = str(venv_py)
+        else:
+            py = sys.executable
+        proc = subprocess.run(
+            [py, str(ROOT / "bin" / "kb" / "index"), "--dry-run", "--json", "--corpus", str(tmp)],
+            cwd=ROOT,
+            capture_output=True,
+            text=True,
+            env=os.environ.copy(),
+            check=False,
+        )
+        self.assertEqual(proc.returncode, 0, proc.stderr)
+        msg = json.loads(proc.stdout)
+        self.assertTrue(msg.get("dry_run"))
+        self.assertGreaterEqual(msg.get("corpus_total", 0), 1)
+        self.assertFalse(lbug.exists(), "dry-run must not create a Ladybug file")
+
+    def test_facts_json_and_chats_land_on_rebuild(self) -> None:
+        """Gitea #18: facts (2-source) + chats markdown become leafs on rebuild."""
+        tmp = Path(tempfile.mkdtemp())
+        dbpath = tmp / "kb.lbug"
+        chats = tmp / "chats"
+        chats.mkdir()
+        (chats / "alice.md").write_text(
+            "# Chat\n\n## Alice and Bob\n\nhello from chats fixture unique-chat-token\n",
+            encoding="utf-8",
+        )
+        facts_path = tmp / "facts.json"
+        facts_path.write_text(json.dumps([{
+            "text": "container 'brain' unique-fact-token is running and declared in compose.yaml",
+            "source": "docker ps x compose.yaml",
+            "loc": "compose.yaml:brain",
+            "how": "facts/extract",
+        }]), encoding="utf-8")
+        venv_py = ROOT / ".venv" / "bin" / "python"
+        py = str(venv_py) if venv_py.is_file() else sys.executable
+        proc = subprocess.run(
+            [
+                py, str(ROOT / "bin" / "kb" / "index"),
+                "--rebuild", "--db", str(dbpath), "--no-defaults",
+                "--with-chats", str(chats),
+                "--facts-json", str(facts_path),
+                "--json",
+            ],
+            cwd=ROOT,
+            capture_output=True,
+            text=True,
+            env=os.environ.copy(),
+            check=False,
+        )
+        self.assertEqual(proc.returncode, 0, proc.stderr)
+        msg = json.loads(proc.stdout)
+        self.assertGreaterEqual(msg.get("facts_leafs", 0), 1)
+        self.assertGreaterEqual(msg.get("chat_leafs", 0), 1)
+        self.assertTrue(dbpath.exists())
+        sys.path.insert(0, str(ROOT / "bin" / "tools"))
+        import kblib
+        db, conn = kblib.connect(dbpath, read_only=True)
+        try:
+            stats = kblib.stats(conn)
+            self.assertGreaterEqual(stats["by_root"].get("facts", 0), 1)
+            fts = kblib.query_fts(conn, "unique-chat-token", 5)
+            self.assertTrue(fts, "chats markdown must be FTS-searchable")
+            fact_hits = kblib.query_fts(conn, "unique-fact-token", 5)
+            self.assertTrue(any(h.get("root") == "facts" for h in fact_hits))
+            src = conn.execute(
+                "MATCH (l:Leaf {root:'facts'}) RETURN l.source"
+            ).get_all()
+            self.assertTrue(any(" x " in str(r[0]) for r in src))
+        finally:
+            conn.close()
+            db.close()

bin/tools/test_kb_add.py

@@ -0,0 +1,69 @@
+"""Incremental add writes leafs without deleting kb.lbug."""
+from __future__ import annotations
+
+import json
+import os
+import subprocess
+import sys
+import tempfile
+import unittest
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[2]
+
+
+class KbAddCLITest(unittest.TestCase):
+    def test_json_add_does_not_delete_db(self) -> None:
+        tmp = Path(tempfile.mkdtemp())
+        dbpath = tmp / "kb.lbug"
+        py = sys.executable
+        venv_py = ROOT / ".venv" / "bin" / "python"
+        if venv_py.is_file():
+            py = str(venv_py)
+        payload = {
+            "text": "cli zebra leaf",
+            "root": "info",
+            "source": "cli-test",
+            "confidence": "confirmed",
+            "how": "test",
+            "loc": str(tmp),
+            "type": "reference",
+            "embedding": [0.0] * 256,
+        }
+        payload["embedding"][0] = 0.3
+        proc = subprocess.run(
+            [py, str(ROOT / "bin" / "kb" / "add"), "--db", str(dbpath), "--json"],
+            cwd=ROOT,
+            input=json.dumps(payload),
+            capture_output=True,
+            text=True,
+            env=os.environ.copy(),
+            check=False,
+        )
+        self.assertEqual(proc.returncode, 0, proc.stderr)
+        self.assertTrue(dbpath.exists(), "add must create the db, not skip write")
+        out = json.loads(proc.stdout)
+        self.assertEqual(out.get("mode"), "add")
+        self.assertEqual(len(out.get("ids") or []), 1)
+        again = subprocess.run(
+            [py, str(ROOT / "bin" / "kb" / "add"), "--db", str(dbpath), "--json"],
+            cwd=ROOT,
+            input=json.dumps({
+                **payload,
+                "text": "second moose leaf",
+                "source": "cli-test-2",
+            }),
+            capture_output=True,
+            text=True,
+            env=os.environ.copy(),
+            check=False,
+        )
+        self.assertEqual(again.returncode, 0, again.stderr)
+        self.assertTrue(dbpath.exists())
+        second = json.loads(again.stdout)
+        self.assertEqual(len(second.get("ids") or []), 1)
+        self.assertNotEqual(out["ids"][0], second["ids"][0])
+
+
+if __name__ == "__main__":
+    unittest.main()

bin/tools/test_kblib.py

@@ -71,6 +71,69 @@ class KblibTest(unittest.TestCase):
         self.assertTrue(hits)
         self.assertIn("Leaf_vec", kblib.leaf_index_names(self.conn))
 
+    def test_add_after_indexes_keeps_fts_queryable(self):
+        """Incremental add after FTS+HNSW must find the new leaf on both indexes."""
+        kblib.upsert_leaf(self.conn, text="seed fox leaf", root="info",
+                          confidence="confirmed", source="s", source_rev="r1",
+                          how="test", loc="/tmp", type_="reference",
+                          embedding=make_emb(0.1))
+        kblib.ensure_indexes(self.conn)
+        ids = kblib.add_leafs(self.conn, [{
+            "text": "added zebra after index",
+            "root": "facts",
+            "confidence": "confirmed",
+            "source": "a.md x b.md",
+            "source_rev": "r1",
+            "how": "test",
+            "loc": "/tmp",
+            "type": "fact",
+            "embedding": make_emb(0.9),
+        }])
+        self.assertEqual(len(ids), 1)
+        fts = kblib.query_fts(self.conn, "zebra", 5)
+        self.assertTrue(fts)
+        self.assertIn("zebra", fts[0]["text"])
+        self.assertEqual(fts[0]["root"], "facts")
+        vec = kblib.query_vector(self.conn, make_emb(0.9), 5)
+        self.assertTrue(any("zebra" in h["text"] for h in vec))
+        fox = kblib.query_fts(self.conn, "fox", 5)
+        self.assertTrue(fox)
+        self.assertIn("fox", fox[0]["text"])
+
+    def test_add_facts_and_info_one_transaction(self):
+        """D12: facts and info land in the same transaction."""
+        kblib.ensure_indexes(self.conn)
+        ids = kblib.add_leafs(self.conn, [
+            {
+                "text": "tx fact leaf two-source",
+                "root": "facts",
+                "confidence": "confirmed",
+                "source": "compose.yml x docker ps",
+                "source_rev": "r1",
+                "how": "test",
+                "loc": "/tmp",
+                "type": "fact",
+                "embedding": make_emb(0.4),
+            },
+            {
+                "text": "tx info narrative",
+                "root": "info",
+                "confidence": "confirmed",
+                "source": "note.md",
+                "source_rev": "r1",
+                "how": "test",
+                "loc": "/tmp",
+                "type": "reference",
+                "embedding": make_emb(0.5),
+            },
+        ])
+        self.assertEqual(len(ids), 2)
+        stats = kblib.stats(self.conn)
+        self.assertEqual(stats["by_root"].get("facts"), 1)
+        self.assertEqual(stats["by_root"].get("info"), 1)
+        self.assertTrue(kblib.query_fts(self.conn, "two-source", 5))
+        self.assertTrue(kblib.query_fts(self.conn, "narrative", 5))
+
     def test_drop_vector_then_create_raises_clear_error(self):
         """DROP INDEX leaves ghost catalog; create_fts_and_vector must raise."""
         kblib.upsert_leaf(self.conn, text="seed", root="info",
@@ -98,6 +161,39 @@ class KblibTest(unittest.TestCase):
         self.assertEqual(stats["total"], 2)
         self.assertEqual(stats["by_root"], {"facts": 1, "info": 1})
 
+    def test_hop_1_returns_file_hop_3_reaches_person(self):
+        """--hop walks FROM_FILE / HAS_VERSION / AUTHORED (Gitea #17)."""
+        import gitimport
+
+        lid = kblib.upsert_leaf(
+            self.conn, text="readme hop fixture", root="info",
+            confidence="confirmed", source="README.md", source_rev="r1",
+            how="test", loc="README.md", type_="reference",
+            embedding=make_emb(0.3),
+        )
+        kblib.link_from_file(self.conn, lid, "README.md", repo="sample-repo")
+        gitimport.index_commits(self.conn, [gitimport.Commit(
+            sha="a1b2c3d",
+            author="Ada Lovelace",
+            email="ada@example.com",
+            date="2026-08-10T12:00:00Z",
+            subject="feat: first commit",
+            files=["README.md"],
+        )], "sample-repo")
+        hop1 = kblib.hop_walk(self.conn, lid, 1)
+        self.assertEqual(len(hop1), 1)
+        self.assertEqual(hop1[0]["label"], "File")
+        self.assertEqual(hop1[0]["name"], "README.md")
+        self.assertEqual(hop1[0]["depth"], 1)
+        hop3 = kblib.hop_walk(self.conn, lid, 3)
+        labels = {n["label"] for n in hop3}
+        self.assertIn("File", labels)
+        self.assertIn("Commit", labels)
+        self.assertIn("Person", labels)
+        person = [n for n in hop3 if n["label"] == "Person"][0]
+        self.assertEqual(person["name"], "Ada Lovelace")
+        self.assertEqual(person["depth"], 3)
+
 
 if __name__ == "__main__":
     unittest.main()

bin/tools/test_mailconv.py

@@ -8,10 +8,13 @@ from pathlib import Path
 sys.path.insert(0, os.path.dirname(__file__))
 
 from mailconv import (  # noqa: E402
+    TESS_LANG,
     clean_email_address,
+    convert_pdf,
     html_to_markdown,
     is_convertible,
     normalize_markdown,
+    ocr_image,
     split_zip_members,
     subject_to_filename,
     zip_extract_safe,
@@ -100,6 +103,92 @@ class TestMailConv(unittest.TestCase):
         self.assertFalse(is_convertible(".exe"))
         self.assertFalse(is_convertible(".unknown"))
 
+    def test_convert_pdf_prefers_pdftotext(self):
+        import mailconv as mc
+
+        calls: list[list[str]] = []
+
+        def fake_run(cmd, **kwargs):
+            calls.append(list(cmd))
+
+            class P:
+                returncode = 0
+                stdout = b"Invoice BM25 layout"
+                stderr = b""
+
+            return P()
+
+        self._patch_run(mc, fake_run)
+        out = convert_pdf(Path(self._tmp("born.pdf")))
+        self.assertIn("BM25", out)
+        self.assertEqual(calls[0][:2], ["pdftotext", "-layout"])
+        self.assertFalse(any(c[0] == "tesseract" for c in calls))
+        self.assertFalse(any(c[0] == "pdftoppm" for c in calls))
+
+    def test_convert_pdf_empty_layer_uses_pdftoppm_tesseract(self):
+        import mailconv as mc
+
+        calls: list[list[str]] = []
+
+        def fake_run(cmd, **kwargs):
+            calls.append(list(cmd))
+
+            class P:
+                returncode = 0
+                stdout = b""
+                stderr = b""
+
+            if cmd[0] == "pdftotext":
+                P.stdout = b"  \n"
+                return P()
+            if cmd[0] == "pdftoppm":
+                prefix = Path(cmd[-1])
+                (prefix.parent / "page-1.png").write_bytes(b"fake")
+                return P()
+            if cmd[0] == "tesseract":
+                P.stdout = b"scanned HELLO"
+                return P()
+            return P()
+
+        self._patch_run(mc, fake_run)
+        out = convert_pdf(Path(self._tmp("scan.pdf")))
+        self.assertIn("HELLO", out)
+        bins = [c[0] for c in calls]
+        self.assertIn("pdftotext", bins)
+        self.assertIn("pdftoppm", bins)
+        self.assertIn("tesseract", bins)
+        tess = next(c for c in calls if c[0] == "tesseract")
+        self.assertIn(TESS_LANG, tess)
+        self.assertNotIn("docling", " ".join(bins))
+
+    def test_ocr_image_paddle_engine(self):
+        import mailconv as mc
+
+        calls: list[list[str]] = []
+
+        def fake_run(cmd, **kwargs):
+            calls.append(list(cmd))
+
+            class P:
+                returncode = 0
+                stdout = b"paddle text"
+                stderr = b""
+
+            return P()
+
+        self._patch_run(mc, fake_run)
+        os.environ["OCR_ENGINE"] = "paddle"
+        try:
+            out = ocr_image(Path(self._tmp("x.png")))
+        finally:
+            os.environ.pop("OCR_ENGINE", None)
+        self.assertEqual(out, "paddle text")
+        self.assertEqual(calls[0][:2], ["paddleocr", "ocr"])
+
+    def _patch_run(self, mod, fn) -> None:
+        self.addCleanup(setattr, mod.subprocess, "run", mod.subprocess.run)
+        mod.subprocess.run = fn
+
     def _mk_zip(self, members):
         zpath = Path(self._tmp("arc.zip"))
         with zipfile.ZipFile(zpath, "w") as zf:

bin/tools/test_published_docs.py

@@ -1,7 +1,6 @@
-"""Published docs must match live commands (Gitea SoT, brain/search, no fake --hop)."""
+"""Published docs must match live commands (Gitea SoT, brain/search)."""
 from __future__ import annotations
 
-import re
 import unittest
 from pathlib import Path
 
@@ -39,19 +38,151 @@ class PublishedDocsTest(unittest.TestCase):
             "mail index is a brain write; README must name bin/brain/index.go",
         )
 
-    def test_docs_do_not_claim_hop_walks(self) -> None:
+    def test_readme_git_import_is_gogit(self) -> None:
+        text = (ROOT / "README.md").read_text()
+        self.assertIn("bin/git/import.go", text)
+        self.assertIn("go-git", text)
+        self.assertIn("D19", (ROOT / "PLAN.md").read_text())
+
+    def test_web_search_is_go_not_ops_host(self) -> None:
+        readme = (ROOT / "README.md").read_text()
+        self.assertIn("bin/web/search.go", readme)
+        skill = (ROOT / "skills" / "web-search" / "SKILL.md").read_text()
+        self.assertIn("bin/web/search.go", skill)
+        self.assertNotIn("search.ops.io", skill)
+        self.assertNotIn("search.ops.io", readme)
+        compose = (ROOT / "compose.yaml").read_text()
+        self.assertIn("searxng", compose)
+        self.assertNotIn("search.ops.io", compose)
+        settings = (ROOT / "deploy" / "searxng" / "settings.yml").read_text()
+        self.assertNotIn("password", settings.lower())
+        self.assertIn("json", settings)
+
+    def test_picoclaw_compose_profile_has_mcp_example(self) -> None:
+        compose = (ROOT / "compose.yaml").read_text()
+        self.assertIn('profiles: ["picoclaw"]', compose)
+        self.assertIn("127.0.0.1:8630", compose)
+        example = (ROOT / "deploy" / "picoclaw" / "mcp.json.example").read_text()
+        self.assertIn("127.0.0.1:8630/mcp", example)
+        self.assertNotIn("password", example.lower())
+        self.assertNotIn("token", example.lower())
+        docs = (ROOT / "docs" / "picoclaw.md").read_text()
+        self.assertIn("search", docs)
+        self.assertIn("throttled", docs)
+
+    def test_readme_read_path_is_go(self) -> None:
+        plan = (ROOT / "PLAN.md").read_text()
+        self.assertIn("get.go", plan)
+        self.assertIn("CI fallback", plan)
+        design = (ROOT / "docs" / "design.md").read_text()
+        self.assertIn("internal/brain/rank", design)
+        self.assertIn("They do not exec Python", design)
+
+    def test_openapi_mcp_from_same_handlers(self) -> None:
+        plan = (ROOT / "PLAN.md").read_text()
+        self.assertIn("D20", plan)
+        self.assertIn("/openapi.json", (ROOT / "README.md").read_text())
+        self.assertIn("/mcp", (ROOT / "README.md").read_text())
+        skill = (ROOT / "skills" / "brain" / "SKILL.md").read_text()
+        self.assertIn("/mcp", skill)
+        self.assertFalse((ROOT / "skills" / "db-yaml").exists())
+        self.assertTrue((ROOT / "skills" / "postgres" / "SKILL.md").is_file())
+
+    def test_cgo_zig_and_index_profile(self) -> None:
+        plan = (ROOT / "PLAN.md").read_text()
+        self.assertIn("D21", plan)
+        self.assertIn("zig cc", plan)
+        dockerfile = (ROOT / "Dockerfile").read_text()
+        self.assertIn("bin/cgo/zcc", dockerfile)
+        self.assertIn("FROM debian:bookworm-slim AS api", dockerfile)
+        self.assertIn("FROM python:3.12-slim AS index", dockerfile)
+        api = dockerfile[dockerfile.index("FROM debian:bookworm-slim AS api") :]
+        self.assertNotIn("pip install", api)
+        compose = (ROOT / "compose.yaml").read_text()
+        self.assertIn('profiles: ["index"]', compose)
+        self.assertIn("target: api", compose)
+
+    def test_reasoner_docs_name_real_hf_ids_cpu_sidecar(self) -> None:
+        docs = (ROOT / "docs" / "reasoner.md").read_text()
+        for hf in (
+            "Qwen/Qwen3.5-9B",
+            "Qwen/Qwen3.6-27B",
+            "prism-ml/Bonsai-27B-gguf",
+        ):
+            self.assertIn(hf, docs)
+        self.assertIn("no official qwen3.6-9b", docs.lower())
+        self.assertIn("OLLAMA_NUM_GPU", docs)
+        self.assertIn("rss_mb", docs)
+        self.assertIn("vram_mb", docs)
+        self.assertIn("3/3", docs)
+        self.assertIn("Do not claim 9B is better at tools", docs)
+        self.assertNotIn("Qwen/Qwen3.6-9B", docs)
+        plan = (ROOT / "PLAN.md").read_text()
+        self.assertIn("D18", plan)
+        self.assertIn("Qwen/Qwen3.5-9B", plan)
+        compose = (ROOT / "compose.yaml").read_text()
+        self.assertIn('"reasoner"', compose)
+        self.assertIn("OLLAMA_NUM_GPU", compose)
+        self.assertIn("127.0.0.1:11435", compose)
+        dockerfile = (ROOT / "Dockerfile").read_text()
+        self.assertNotIn(".gguf", dockerfile.lower())
+        self.assertNotIn(".safetensors", dockerfile.lower())
+        api = dockerfile[dockerfile.index("FROM debian:bookworm-slim AS api") :]
+        self.assertNotIn("COPY models", api)
+        self.assertNotIn("qwen", api.lower())
+
+    def test_readme_search_escalates_web(self) -> None:
+        text = (ROOT / "README.md").read_text()
+        self.assertIn("--no-web", text)
+        self.assertIn("D17", (ROOT / "PLAN.md").read_text())
+        skill = (ROOT / "skills" / "brain" / "SKILL.md").read_text()
+        self.assertIn("`web` block", skill)
+
+    def test_docs_say_hop_walks_from_file(self) -> None:
         paths = [
             ROOT / "README.md",
             ROOT / "docs" / "design.md",
-            ROOT / "skills" / "kb-search" / "SKILL.md",
-            ROOT / "skills" / "diataxis-docs" / "SKILL.md",
+            ROOT / "skills" / "brain" / "SKILL.md",
+            ROOT / "docs" / "runbook.md",
+            ROOT / "docs" / "README.md",
         ]
-        # Command-style `--hop 1` / `--hop N` plus follow/walk = the old lie.
-        # Honest "not implemented" notes must not match.
-        lie = re.compile(r"--hop (?:N|1).*(?:follow|walk)", re.I | re.S)
         for path in paths:
             text = path.read_text()
-            self.assertIsNone(
-                lie.search(text),
-                f"{path.relative_to(ROOT)} still claims --hop walks the graph",
+            self.assertIn("--hop", text, f"{path.relative_to(ROOT)} must document --hop")
+            self.assertNotIn(
+                "not implemented",
+                text.lower(),
+                f"{path.relative_to(ROOT)} still says hop is not implemented",
             )
+
+    def test_docs_are_portable_diataxis(self) -> None:
+        index = (ROOT / "docs" / "README.md").read_text()
+        self.assertIn("type: reference", index)
+        for d in ("D3", "D6", "D14", "D15", "D17", "D18"):
+            self.assertIn(d, index)
+        runbook = (ROOT / "docs" / "runbook.md").read_text()
+        self.assertIn("type: howto", runbook)
+        self.assertIn("bin/brain/search.go", runbook)
+        self.assertIn("bin/brain/index.go", runbook)
+        self.assertNotIn("search.ops.io", runbook)
+        self.assertNotIn("/mnt/", runbook)
+        self.assertNotIn("/home/", runbook)
+        readme = (ROOT / "README.md").read_text()
+        self.assertIn("docs/runbook.md", readme)
+        self.assertNotIn("search.ops.io", readme)
+
+    def test_v1_epic_is_named_in_docs(self) -> None:
+        plan = (ROOT / "PLAN.md").read_text()
+        self.assertIn("Gap to v1", plan)
+        self.assertIn("eSlider/2dph/issues/16", plan)
+        self.assertIn("eSlider/2dph/issues/17", plan)
+        self.assertIn("eSlider/2dph/milestone/12", plan)
+        road = (ROOT / "docs" / "roadmap.md").read_text()
+        self.assertIn("type: explanation", road)
+        self.assertIn("issues/16", road)
+        self.assertIn("issues/14", road)
+        index = (ROOT / "docs" / "README.md").read_text()
+        self.assertIn("roadmap.md", index)
+        self.assertIn("epic #16", index)
+        agents = (ROOT / "AGENTS.md").read_text()
+        self.assertIn("roadmap.md", agents)

bin/tools/test_skills.py

@@ -0,0 +1,63 @@
+"""Skills must name live commands; every bin/ path in SKILL.md must exist."""
+from __future__ import annotations
+
+import re
+import unittest
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[2]
+BIN_PATH = re.compile(r"(bin/[A-Za-z0-9_./-]+)")
+
+
+class SkillsTest(unittest.TestCase):
+    def test_db_yaml_renamed_to_postgres(self) -> None:
+        self.assertFalse(
+            (ROOT / "skills" / "db-yaml").exists(),
+            "skills/db-yaml must be skills/postgres",
+        )
+        self.assertTrue((ROOT / "skills" / "postgres" / "SKILL.md").is_file())
+        text = (ROOT / "skills" / "postgres" / "SKILL.md").read_text()
+        self.assertIn("bin/postgres/query.go", text)
+        self.assertNotIn("search.ops.io", text)
+
+    def test_every_bin_path_in_skills_exists(self) -> None:
+        missing: list[str] = []
+        for path in (ROOT / "skills").rglob("SKILL.md"):
+            text = path.read_text()
+            for m in BIN_PATH.finditer(text):
+                rel = m.group(1).rstrip(")`.,;")
+                candidate = ROOT / rel
+                if not candidate.exists():
+                    missing.append(f"{path.relative_to(ROOT)}: {rel}")
+        self.assertEqual(missing, [], "skill bin paths must exist")
+
+    def test_brain_skill_lists_generated_tools(self) -> None:
+        tools = (ROOT / "skills" / "brain" / "tools.md").read_text()
+        skill = (ROOT / "skills" / "brain" / "SKILL.md").read_text()
+        self.assertIn("tools.md", skill)
+        for name in ("search", "get", "stats", "audit"):
+            self.assertIn(f"`{name}`", tools)
+
+    def test_picoclaw_lists_tool_order(self) -> None:
+        skill = (ROOT / "skills" / "picoclaw" / "SKILL.md").read_text()
+        agents = (ROOT / "AGENTS.md").read_text()
+        self.assertIn("**`search`**", skill)
+        self.assertIn("**`get`**", skill)
+        self.assertIn("**`audit`**", skill)
+        self.assertIn("throttled", skill.lower())
+        self.assertIn("not a negative finding", agents)
+        self.assertIn("Fact-check every", agents)
+
+    def test_yq_is_mikefarah_for_structured_data(self) -> None:
+        skill = (ROOT / "skills" / "yq" / "SKILL.md").read_text()
+        self.assertIn("https://github.com/mikefarah/yq", skill)
+        for fmt in ("YAML", "JSON", "XML", "CSV", "TOML", "HCL"):
+            self.assertIn(fmt, skill)
+        self.assertIn("not kislyuk", skill.lower())
+        plan = (ROOT / "PLAN.md").read_text()
+        self.assertIn("mikefarah/yq", plan)
+        agents = (ROOT / "AGENTS.md").read_text()
+        self.assertIn("mikefarah/yq", agents)
+        web = (ROOT / "skills" / "web-search" / "SKILL.md").read_text()
+        self.assertIn("| yq ", web)
+        self.assertNotIn("| jq ", web)

bin/tools/test_skills_bin_paths.py

@@ -0,0 +1,33 @@
+"""Every bin/ path named in skills/ must exist on disk."""
+from __future__ import annotations
+
+import re
+import unittest
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[2]
+BIN_PATH = re.compile(r"\b(bin/[A-Za-z0-9_./-]+)")
+
+
+class SkillsBinPathsTest(unittest.TestCase):
+    def test_agent_cost_skill_is_gone(self) -> None:
+        self.assertFalse(
+            (ROOT / "skills" / "agent-cost").exists(),
+            "skills/agent-cost documents bin/agents/cost which does not exist",
+        )
+
+    def test_brain_skill_replaces_kb_search(self) -> None:
+        self.assertTrue((ROOT / "skills" / "brain" / "SKILL.md").is_file())
+        self.assertFalse((ROOT / "skills" / "kb-search").exists())
+
+    def test_skill_bin_paths_exist(self) -> None:
+        missing: list[str] = []
+        for skill in sorted((ROOT / "skills").rglob("SKILL.md")):
+            text = skill.read_text()
+            for match in BIN_PATH.findall(text):
+                rel = match.rstrip("`'.,")
+                if rel.endswith(".go") or Path(rel).suffix == "" or Path(rel).suffix in {".go", ".py"}:
+                    p = ROOT / rel
+                    if not p.exists():
+                        missing.append(f"{skill.relative_to(ROOT)}: {rel}")
+        self.assertEqual(missing, [], "SKILL.md names bin/ paths that do not exist")

bin/tools/test_system_perf.py

@@ -0,0 +1,36 @@
+"""qa/system_perf.py is an offline-gated system test (no live brain in CI)."""
+from __future__ import annotations
+
+import ast
+import unittest
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[2]
+
+
+class SystemPerfScriptTest(unittest.TestCase):
+    def test_script_compiles_and_is_read_only(self) -> None:
+        path = ROOT / "qa" / "system_perf.py"
+        src = path.read_text()
+        compile(src, str(path), "exec")
+        self.assertIn("--json", src)
+        self.assertIn("qwen3.5:9b", src)
+        self.assertIn("--picoclaw", src)
+        self.assertIn("BRAIN_URL", src)
+        self.assertIn("tools/list", src)
+        self.assertIn("tools/call", src)
+        self.assertIn("GATE_HEALTH_MS", src)
+        self.assertIn("GATE_GET_P50_MS", src)
+        self.assertNotIn("kb.lbug", src)
+        self.assertNotIn("password", src.lower())
+        self.assertNotIn("token", src.lower())
+
+    def test_script_does_not_write_ladybug(self) -> None:
+        tree = ast.parse((ROOT / "qa" / "system_perf.py").read_text())
+        writes = [
+            n.func.attr
+            for n in ast.walk(tree)
+            if isinstance(n, ast.Call) and isinstance(n.func, ast.Attribute)
+            and n.func.attr in {"write_text", "write_bytes", "dump"}
+        ]
+        self.assertEqual(writes, [], f"system_perf must not write files: {writes}")

bin/web/search

@@ -1,150 +1,26 @@
 #!/usr/bin/env python3
-"""web/search - web search through the self-hosted SearXNG at search.ops.io.
+"""web/search — deprecated. Use bin/web/search.go (SearXNG, no Python client).
 
-  bin/web/search "LadybugDB vector search"
-  bin/web/search "model2vec multilingual" --site github.com
-  bin/web/search "uclancy" --category it -n 3 --json | jq -r '.results[].url'
-  bin/web/search "sqlite-vec" --refresh          # ignore the cached answer
-
-This complements bin/kb/search: the knowledge base holds our own facts, this
-reaches the public web. Use it as the second, independent source that the
-detective method asks for.
-
-Exit codes: 0 results, 2 refused as possible PII, 3 throttled (not "nothing
-found" - the instance answers 200 with an empty list when it throttles).
+  bin/web/search.go QUERY [--json] [-n N] [--site HOST]
 """
 from __future__ import annotations
 
-import argparse
-import fcntl
-import json
 import os
 import sys
-import time
-import urllib.parse
-import urllib.request
 from pathlib import Path
 
-TOOLS = Path(__file__).resolve().parents[1] / "tools"
-sys.path.insert(0, str(TOOLS))
-sys.path.insert(0, str(TOOLS / "web-search"))
-
-import websearch as ws          # noqa: E402
-from yamlout import to_yaml     # noqa: E402
-
-CONFIG = Path(os.environ.get("BRAIN_SEARCH_ENV", Path.home() / ".config/brain/search.env"))
-CACHE = Path(os.environ.get("BRAIN_SEARCH_CACHE", Path.home() / ".cache/brain/web-search.sqlite"))
-LOCK = CACHE.with_suffix(".lock")
+ROOT = Path(__file__).resolve().parents[2]
 
 
-def load_config() -> dict:
-    if not CONFIG.exists():
-        sys.exit(f"no credentials at {CONFIG} (mode 600, BRAIN_SEARCH_URL/USER/PASS)")
-    conf = {}
-    for line in CONFIG.read_text().splitlines():
-        line = line.strip()
-        if not line or line.startswith("#") or "=" not in line:
-            continue
-        key, _, value = line.partition("=")
-        conf[key.strip()] = value.strip().strip("\"'")
-    missing = {"BRAIN_SEARCH_URL", "BRAIN_SEARCH_USER", "BRAIN_SEARCH_PASS"} - conf.keys()
-    if missing:
-        sys.exit(f"{CONFIG} is missing {', '.join(sorted(missing))}")
-    return conf
-
-
-def fetch(conf: dict, query: str, params: dict, timeout: int) -> dict:
-    args = {"q": query, "format": "json", **params}
-    url = f"{conf['BRAIN_SEARCH_URL'].rstrip('/')}/search?{urllib.parse.urlencode(args)}"
-    request = urllib.request.Request(url)
-    token = f"{conf['BRAIN_SEARCH_USER']}:{conf['BRAIN_SEARCH_PASS']}".encode()
-    import base64
-    request.add_header("Authorization", "Basic " + base64.b64encode(token).decode())
-    with urllib.request.urlopen(request, timeout=timeout) as response:
-        return json.loads(response.read().decode())
-
-
-def main() -> int:
-    parser = argparse.ArgumentParser(description="web search via SearXNG")
-    parser.add_argument("query")
-    parser.add_argument("-n", "--limit", type=int, default=ws.DEFAULT_LIMIT)
-    parser.add_argument("--site", help="restrict to one domain")
-    parser.add_argument("--lang", help="language code, e.g. de")
-    parser.add_argument("--fresh", choices=["day", "week", "month", "year"],
-                        help="time range")
-    parser.add_argument("--category", help="SearXNG category, e.g. it, science, news")
-    parser.add_argument("--engines", help="comma separated engine list")
-    parser.add_argument("--json", action="store_true")
-    parser.add_argument("--refresh", action="store_true", help="bypass the cache")
-    parser.add_argument("--ttl", type=float, default=ws.CACHE_TTL)
-    parser.add_argument("--timeout", type=int, default=25)
-    parser.add_argument("--force", action="store_true",
-                        help="send even if the query looks like PII")
-    args = parser.parse_args()
-
-    query = f"site:{args.site} {args.query}" if args.site else args.query
-
-    reason = ws.phi_reason(query)
-    if reason and not args.force:
-        print(f"refused: {reason}. This query would leave the host.", file=sys.stderr)
-        print("Rephrase without identifiers, or pass --force if it is genuinely public.",
-              file=sys.stderr)
-        return 2
-
-    params = {}
-    if args.lang:
-        params["language"] = args.lang
-    if args.fresh:
-        params["time_range"] = args.fresh
-    if args.category:
-        params["categories"] = args.category
-    if args.engines:
-        params["engines"] = args.engines
-
-    key = ws.cache_key(query, params)
-    conn = ws.open_cache(CACHE)
-
-    if not args.refresh:
-        cached = ws.cache_get(conn, key, ttl=args.ttl)
-        if cached is not None:
-            out = ws.project(cached, limit=args.limit)
-            out["cached"] = True
-            sys.stdout.write(json.dumps(out, indent=2, ensure_ascii=False) + "\n"
-                             if args.json else to_yaml(out))
-            return 0
-
-    conf = load_config()
-    LOCK.parent.mkdir(parents=True, exist_ok=True)
-
-    # One request at a time across every agent on this host: the instance
-    # suspends engines for minutes when several of us ask at once.
-    with open(LOCK, "w") as lock:
-        fcntl.flock(lock, fcntl.LOCK_EX)
-
-        payload = None
-        for attempt in range(1 + len(ws.RETRY_BACKOFF)):
-            delay = ws.wait_for(ws.last_call(conn), time.time())
-            if delay:
-                time.sleep(delay)
-            ws.mark_call(conn)
-            try:
-                payload = fetch(conf, query, params, args.timeout)
-            except Exception as error:              # noqa: BLE001 - report, do not crash
-                print(f"request failed: {error}", file=sys.stderr)
-                return 3
-            if ws.classify(payload) == "ok":
-                break
-            if attempt < len(ws.RETRY_BACKOFF):
-                time.sleep(ws.RETRY_BACKOFF[attempt])
-
-    if ws.classify(payload) == "ok":
-        ws.cache_put(conn, key, payload)
-
-    out = ws.project(payload, limit=args.limit)
-    sys.stdout.write(json.dumps(out, indent=2, ensure_ascii=False) + "\n"
-                     if args.json else to_yaml(out))
-    return 0 if out["status"] == "ok" else 3
+def main(argv: list[str]) -> int:
+    print(
+        "bin/web/search is deprecated; use bin/web/search.go",
+        file=sys.stderr,
+    )
+    target = ROOT / "bin" / "web" / "search.go"
+    os.execvp("go", ["go", "run", str(target), *argv])
+    return 1
 
 
 if __name__ == "__main__":
-    sys.exit(main())
+    sys.exit(main(sys.argv[1:]))

bin/web/search.go

@@ -0,0 +1,232 @@
+//usr/bin/env go run "$0" "$@"; exit
+//
+// bin/web/search.go - SearXNG as the second independent source (D3).
+//
+//	./bin/web/search.go "LadybugDB vector search"
+//	./bin/web/search.go "model2vec" --category it --json
+//	./bin/web/search.go "postgres" --site github.com --fresh year
+//
+// Empty results mean throttled, not "nothing exists". Exit 2 = PII refuse, 3 = throttled.
+// Config: $BRAIN_SEARCH_ENV (default $HOME/.config/brain/search.env).
+// NOTE: never run `gofmt -w` on this file — it breaks the shebang.
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"os"
+	"strconv"
+	"time"
+
+	"github.com/eSlider/2dph/internal/websearch"
+	"golang.org/x/sys/unix"
+)
+
+func main() {
+	os.Exit(run(os.Args[1:]))
+}
+
+func run(args []string) int {
+	var (
+		query, site, lang, fresh, category, engines string
+		limit                                       = websearch.DefaultLimit
+		jsonOut, refresh, force                     bool
+		ttl                                         = float64(websearch.CacheTTL)
+		timeout                                     = 25
+	)
+	i := 0
+	for i < len(args) {
+		a := args[i]
+		switch {
+		case a == "--json":
+			jsonOut = true
+		case a == "--refresh":
+			refresh = true
+		case a == "--force":
+			force = true
+		case (a == "-n" || a == "--limit") && i+1 < len(args):
+			i++
+			n, err := strconv.Atoi(args[i])
+			if err != nil || n < 0 {
+				fmt.Fprintln(os.Stderr, "web/search: --limit must be a non-negative integer")
+				return 2
+			}
+			limit = n
+		case a == "--site" && i+1 < len(args):
+			i++
+			site = args[i]
+		case a == "--lang" && i+1 < len(args):
+			i++
+			lang = args[i]
+		case a == "--fresh" && i+1 < len(args):
+			i++
+			fresh = args[i]
+		case a == "--category" && i+1 < len(args):
+			i++
+			category = args[i]
+		case a == "--engines" && i+1 < len(args):
+			i++
+			engines = args[i]
+		case a == "--ttl" && i+1 < len(args):
+			i++
+			v, err := strconv.ParseFloat(args[i], 64)
+			if err != nil {
+				fmt.Fprintln(os.Stderr, "web/search: --ttl must be a number")
+				return 2
+			}
+			ttl = v
+		case a == "--timeout" && i+1 < len(args):
+			i++
+			n, err := strconv.Atoi(args[i])
+			if err != nil || n <= 0 {
+				fmt.Fprintln(os.Stderr, "web/search: --timeout must be a positive integer")
+				return 2
+			}
+			timeout = n
+		case a == "-h" || a == "--help":
+			fmt.Fprintln(os.Stderr, `usage: bin/web/search.go QUERY [--json] [-n N] [--site HOST] [--lang LANG] [--fresh day|week|month|year] [--category CAT] [--engines LIST] [--refresh] [--force]`)
+			return 0
+		case len(a) > 0 && a[0] != '-' && query == "":
+			query = a
+		default:
+			fmt.Fprintf(os.Stderr, "web/search: unknown flag %s\n", a)
+			return 2
+		}
+		i++
+	}
+	if query == "" {
+		fmt.Fprintln(os.Stderr, "web/search: query required")
+		return 2
+	}
+	if site != "" {
+		query = "site:" + site + " " + query
+	}
+	if reason := websearch.PHIReason(query); reason != "" && !force {
+		fmt.Fprintf(os.Stderr, "refused: %s. This query would leave the host.\n", reason)
+		fmt.Fprintln(os.Stderr, "Rephrase without identifiers, or pass --force if it is genuinely public.")
+		return 2
+	}
+
+	params := map[string]string{}
+	if lang != "" {
+		params["language"] = lang
+	}
+	if fresh != "" {
+		params["time_range"] = fresh
+	}
+	if category != "" {
+		params["categories"] = category
+	}
+	if engines != "" {
+		params["engines"] = engines
+	}
+
+	cachePath := os.Getenv("BRAIN_SEARCH_CACHE")
+	if cachePath == "" {
+		cachePath = os.Getenv("HOME") + "/.cache/brain/web-search.sqlite"
+	}
+	cache, err := websearch.OpenCache(cachePath)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "web/search: cache: %v\n", err)
+		return 1
+	}
+	defer cache.Close()
+
+	key := websearch.CacheKey(query, params)
+	now := float64(time.Now().Unix())
+	if !refresh {
+		if cached, err := cache.Get(key, ttl, now); err != nil {
+			fmt.Fprintf(os.Stderr, "web/search: cache: %v\n", err)
+			return 1
+		} else if cached != nil {
+			out := websearch.Project(*cached, limit, websearch.DefaultSnippetChars)
+			out.Cached = true
+			return writeOut(out, jsonOut)
+		}
+	}
+
+	envPath := os.Getenv("BRAIN_SEARCH_ENV")
+	if envPath == "" {
+		envPath = os.Getenv("HOME") + "/.config/brain/search.env"
+	}
+	conf, err := websearch.LoadConfig(envPath)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "web/search: %v\n", err)
+		return 1
+	}
+
+	lockPath := cachePath + ".lock"
+	lock, err := os.OpenFile(lockPath, os.O_CREATE|os.O_RDWR, 0o600)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "web/search: lock: %v\n", err)
+		return 1
+	}
+	defer lock.Close()
+	if err := unix.Flock(int(lock.Fd()), unix.LOCK_EX); err != nil {
+		fmt.Fprintf(os.Stderr, "web/search: lock: %v\n", err)
+		return 1
+	}
+	defer unix.Flock(int(lock.Fd()), unix.LOCK_UN)
+
+	var payload websearch.Payload
+	attempts := 1 + len(websearch.RetryBackoff)
+	client := &http.Client{}
+	for attempt := 0; attempt < attempts; attempt++ {
+		last, err := cache.LastCall()
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "web/search: cache: %v\n", err)
+			return 1
+		}
+		if delay := websearch.WaitFor(last, float64(time.Now().Unix()), websearch.MinInterval); delay > 0 {
+			time.Sleep(time.Duration(delay * float64(time.Second)))
+		}
+		if err := cache.MarkCall(float64(time.Now().Unix())); err != nil {
+			fmt.Fprintf(os.Stderr, "web/search: cache: %v\n", err)
+			return 1
+		}
+		payload, err = websearch.Fetch(client, conf, query, params, time.Duration(timeout)*time.Second)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "request failed: %v\n", err)
+			return 3
+		}
+		if websearch.Classify(payload) == websearch.StatusOK {
+			break
+		}
+		if attempt < len(websearch.RetryBackoff) {
+			time.Sleep(time.Duration(websearch.RetryBackoff[attempt] * float64(time.Second)))
+		}
+	}
+
+	if websearch.Classify(payload) == websearch.StatusOK {
+		if err := cache.Put(key, payload, float64(time.Now().Unix())); err != nil {
+			fmt.Fprintf(os.Stderr, "web/search: cache: %v\n", err)
+		}
+	}
+	out := websearch.Project(payload, limit, websearch.DefaultSnippetChars)
+	code := writeOut(out, jsonOut)
+	if out.Status != websearch.StatusOK && code == 0 {
+		return 3
+	}
+	return code
+}
+
+func writeOut(out websearch.Output, jsonOut bool) int {
+	if jsonOut {
+		enc := json.NewEncoder(os.Stdout)
+		enc.SetIndent("", "  ")
+		enc.SetEscapeHTML(false)
+		if err := enc.Encode(out); err != nil {
+			return 1
+		}
+		if out.Status != websearch.StatusOK {
+			return 3
+		}
+		return 0
+	}
+	fmt.Print(out.YAML())
+	if out.Status != websearch.StatusOK {
+		return 3
+	}
+	return 0
+}

compose.yaml

@@ -1,66 +1,176 @@
 # 2dph — docker composition
 #
-#   docker compose run --rm brain index                     # rebuild graph
-#   docker compose run --rm brain search "Matrix fed"       # one-shot query
-#   docker compose run --rm brain serve                     # async Go server
-#   docker compose up brain-watch                           # auto re-index
+#   docker compose up -d brain                  # API (Zig CGO serve)
+#   docker compose --profile index run --rm index   # Python rebuild
+#   docker compose --profile picoclaw up -d     # brain-mcp + CPU reasoner + PicoClaw gateway
+#   docker compose --profile reasoner up -d reasoner   # CPU Ollama :11435
+#   docker compose --profile searxng up -d
+#   OCR_ENGINE=paddle docker compose --profile ocr-paddle run --rm ocr-paddle
 #
-# Caching: the 128M model (HF_HOME) and kb.lbug (VAR_DIR) live in named
-# volumes, so rebuilds never redownload the model or re-derive the graph.
-# Secrets are never baked into the image: search.env + db-profiles.yml mount
-# read-only from ~/.config/brain.
+# Secrets never baked in: search.env + db-profiles.yml from ~/.config/brain.
 
 name: 2dph
 
+networks:
+  default:
+    name: 2dph_sys
+    driver: bridge
+    ipam:
+      config:
+        - subnet: 10.23.42.0/24
+
 services:
   brain:
-    image: ghcr.io/eslider/2dph:latest
+    image: ghcr.io/eslider/2dph:api
     build:
       context: .
       dockerfile: Dockerfile
+      target: api
       cache_from:
         - ghcr.io/eslider/2dph:cache
-    command: ["brain", "search", "help"]
+    command: ["serve"]
     environment: &env
       HF_HOME: /data/hf
       BRAIN_SEARCH_CACHE: /data/cache/web-search.sqlite
       BRAIN_DB_PROFILES: /secret/db-profiles.yml
       BRAIN_SEARCH_ENV: /secret/search.env
-      KB_SEARCH_CMD: /app/bin/kb/search
+      KB_ROOT: /data
       KB_WORKERS: "4"
+      KB_PORT: "8630"
     volumes:
       - kb-model:/data/hf
       - kb-var:/data
-      # corpus is read-only on the host, never written from the container
-      - ..:/corpus:ro
       - ~/.config/brain:/secret:ro
+    ports:
+      - "127.0.0.1:8630:8630"
     read_only: true
     tmpfs:
       - /tmp
     healthcheck:
-      test: ["CMD", "python3", "-c", "import ladybug, model2vec, mistune; print('ok')"]
+      test: ["CMD", "wget", "-qO-", "http://127.0.0.1:8630/health"]
       interval: 30s
       timeout: 5s
       retries: 3
     restart: unless-stopped
     stop_grace_period: 20s
 
-  # watcher: re-index on corpus file change (watchdog script)
   brain-watch:
-    image: ghcr.io/eslider/2dph:latest
+    image: ghcr.io/eslider/2dph:api
     environment: *env
     volumes:
       - kb-model:/data/hf
       - kb-var:/data
       - ..:/corpus:ro
       - ~/.config/brain:/secret:ro
-    command: ["brain", "watch", "/corpus"]
+    command: ["watch", "/corpus"]
     read_only: true
     tmpfs:
       - /tmp
     restart: unless-stopped
     stop_grace_period: 20s
 
+  # Python write path (Ladybug rebuild). Not in the API image.
+  #   docker compose --profile index run --rm index
+  index:
+    profiles: ["index"]
+    image: ghcr.io/eslider/2dph:index
+    build:
+      context: .
+      dockerfile: Dockerfile
+      target: index
+    environment:
+      HF_HOME: /data/hf
+      KB_PY: python3
+    volumes:
+      - kb-model:/data/hf
+      - kb-var:/app/var
+      - ..:/corpus:ro
+      - ~/.config/brain:/secret:ro
+    command: ["index"]
+    read_only: true
+    tmpfs:
+      - /tmp
+
+  # Optional local SearXNG (D3). Skip if BRAIN_SEARCH_URL already points at a
+  # live instance — do not run a second copy on that host.
+  #   SEARXNG_SECRET=$(openssl rand -hex 32) docker compose --profile searxng up -d
+  searxng:
+    profiles: ["searxng"]
+    image: docker.io/searxng/searxng:2026.8.10-0a118066d
+    ports:
+      - "127.0.0.1:8888:8080"
+    environment:
+      SEARXNG_SECRET: ${SEARXNG_SECRET:-}
+    volumes:
+      - ./deploy/searxng/settings.yml:/etc/searxng/settings.yml:ro
+      - ./deploy/searxng/limiter.toml:/etc/searxng/limiter.toml:ro
+    restart: unless-stopped
+
+  # MCP endpoint for PicoClaw (and any MCP client).
+  #   docker compose --profile picoclaw up -d
+  brain-mcp:
+    profiles: ["picoclaw"]
+    image: ghcr.io/eslider/2dph:api
+    environment: *env
+    volumes:
+      - kb-model:/data/hf
+      - kb-var:/data
+      - ~/.config/brain:/secret:ro
+    command: ["serve"]
+    ports:
+      - "127.0.0.1:8630:8630"
+    read_only: true
+    tmpfs:
+      - /tmp
+    restart: unless-stopped
+
+  # CPU OpenAI-compatible sidecar (D18). Weights are pulled at runtime, not
+  # baked into the 2dph image. Does not touch host Ollama on :11434.
+  #   docker compose --profile reasoner up -d reasoner
+  #   docker compose --profile reasoner exec reasoner ollama pull qwen3.5:9b
+  reasoner:
+    profiles: ["reasoner", "picoclaw"]
+    image: docker.io/ollama/ollama:latest
+    environment:
+      OLLAMA_NUM_GPU: "0"
+      OLLAMA_HOST: "0.0.0.0:11434"
+    ports:
+      - "127.0.0.1:11435:11434"
+    volumes:
+      - reasoner-ollama:/root/.ollama
+    restart: unless-stopped
+
+  # Official PicoClaw gateway. Config has no secrets (Ollama + HTTP MCP).
+  # Host network: brain/reasoner bind 127.0.0.1 only, so host.docker.internal
+  # (docker0) cannot reach them. Gateway 127.0.0.1:18790 (not the 18800 launcher).
+  # If :8630/:11435 are already bound, do not start brain-mcp/reasoner:
+  #   docker compose --profile picoclaw up -d --no-deps picoclaw
+  picoclaw:
+    profiles: ["picoclaw"]
+    image: docker.io/sipeed/picoclaw:v0.3.1
+    network_mode: host
+    depends_on:
+      - brain-mcp
+      - reasoner
+    environment:
+      PICOCLAW_GATEWAY_HOST: "127.0.0.1"
+    entrypoint: ["picoclaw", "gateway"]
+    volumes:
+      - picoclaw-home:/root/.picoclaw
+      - ./deploy/picoclaw/config.json:/root/.picoclaw/config.json:ro
+    restart: unless-stopped
+
+  # Optional PP-OCRv5 (not default). Default OCR is tesseract eng+deu.
+  #   OCR_ENGINE=paddle docker compose --profile ocr-paddle run --rm ocr-paddle
+  ocr-paddle:
+    profiles: ["ocr-paddle"]
+    image: python:3.12-slim
+    environment:
+      OCR_ENGINE: paddle
+    command: ["python", "-c", "print('OCR_ENGINE=paddle; install paddleocr on PATH')"]
+
 volumes:
   kb-model:
-  kb-var:
+  kb-var:
+  reasoner-ollama:
+  picoclaw-home:

deploy/picoclaw/config.json

@@ -0,0 +1,33 @@
+{
+  "agents": {
+    "defaults": {
+      "model_name": "qwen3.5-9b",
+      "max_tool_iterations": 8,
+      "max_tokens": 512,
+      "context_window": 8192
+    }
+  },
+  "model_list": [
+    {
+      "model_name": "qwen3.5-9b",
+      "model": "ollama/qwen3.5:9b",
+      "api_base": "http://127.0.0.1:11435/v1",
+      "request_timeout": 600
+    }
+  ],
+  "tools": {
+    "web": {
+      "enabled": false
+    },
+    "mcp": {
+      "enabled": true,
+      "servers": {
+        "2dph": {
+          "enabled": true,
+          "type": "http",
+          "url": "http://127.0.0.1:8630/mcp"
+        }
+      }
+    }
+  }
+}

deploy/picoclaw/mcp.json.example

@@ -0,0 +1,8 @@
+{
+  "mcpServers": {
+    "2dph": {
+      "url": "http://127.0.0.1:8630/mcp",
+      "description": "2dph fact gate. Tool order: search → get → audit. throttled is not absence."
+    }
+  }
+}

deploy/searxng/limiter.toml

@@ -0,0 +1,7 @@
+[botdetection.ip_lists]
+# RFC1918 only. Do not copy a live instance egress IP into git.
+pass_ip = [
+  "10.0.0.0/8",
+  "172.16.0.0/12",
+  "192.168.0.0/16",
+]

deploy/searxng/settings.yml

@@ -0,0 +1,28 @@
+use_default_settings: true
+
+general:
+  instance_name: "2dph"
+
+search:
+  formats:
+    - html
+    - json
+  suspended_times:
+    SearxEngineCaptcha: 300
+    SearxEngineTooManyRequests: 120
+    SearxEngineAccessDenied: 300
+
+server:
+  limiter: true
+  image_proxy: false
+  # secret_key comes from SEARXNG_SECRET (never commit a real secret)
+
+engines:
+  - name: bing
+    disabled: false
+  - name: google
+    disabled: false
+  - name: duckduckgo
+    disabled: false
+  - name: wikipedia
+    disabled: false

docs/README.md

@@ -1,14 +1,38 @@
-# 2dph (deductionphile)
+---
+type: reference
+status: current
+related:
+  - docs/runbook.md
+  - docs/design.md
+  - PLAN.md
+  - docs/roadmap.md
+---
 
-Evidence-first knowledge graph + hybrid RAG over the operational
-Brain/ops/eSlider stack. Facts need proof or they are
+# 2dph docs (Diataxis)
+
+Evidence-first knowledge graph. Facts need proof or they are
 `(not confirmed)`.
 
-- [PLAN.md](../PLAN.md) — decisions, execution order, open questions (v2)
-- [design](design.md) — schema, deduction model, sources
-- [Gitea issues](https://git.produktor.io/eSlider/2dph/issues) — work board (origin)
+| Type | Doc |
+|------|-----|
+| tutorial / howto | [runbook](runbook.md) — run anywhere (uv, Go, Docker) |
+| explanation | [design](design.md) — two roots, deduction, D17/D20/D18 |
+| explanation | [roadmap](roadmap.md) — gap to v1 (epic #16) |
+| howto | [picoclaw](picoclaw.md) — MCP agent profile |
+| howto | [reasoner](reasoner.md) — CPU bake-off (D18) |
+| reference | [PLAN.md](../PLAN.md) — decisions D1–D22 |
 
-Search: `bin/brain/search.go "query"` (HTTP: `bin/brain/serve.go`). `--hop` is
-not a walk; the flag errors until File/FROM_FILE edges exist.
+Decisions the public face must name: **D3** SearXNG compose, **D6** Go service /
+Python write sidecar, **D14** `bin/{subject}/{method}.go`, **D15** Gitea origin,
+**D17** assertion gate (facts → info → web), **D18** pluggable reasoner.
 
-Published docs live here and mirror the project state.
+Search: `bin/brain/search.go "query"` (HTTP: `bin/brain/serve.go` —
+`/health` `/search` `/get` `/stats` `/audit` `/ingest`). `--hop N` walks
+`FROM_FILE` → Commit → Person from each hit (max 3). Rebuild writes
+File edges ([#17](https://git.produktor.io/eSlider/2dph/issues/17)).
+
+Work board: [Gitea issues](https://git.produktor.io/eSlider/2dph/issues)
+([epic #16](https://git.produktor.io/eSlider/2dph/issues/16)).
+PRs and CI: GitHub [`eSlider/2dph`](https://github.com/eSlider/2dph).
+
+Published docs live here and match live commands.

docs/chat-import-plan.md

@@ -21,4 +21,5 @@ OO_CLI                     (default: $HOME/go/bin/oo)
 ./bin/chats/apply.go --dry-run
 ```
 
-JSONL → markdown only. Brain ingest is `bin/brain/index.go` (not a `chats index`).
+JSONL → markdown only. Brain ingest is `bin/brain/index.go --with-chats`
+(default `var/chats/md`). WhatsApp sync is out of v1.

docs/design.md

@@ -1,3 +1,12 @@
+---
+type: explanation
+status: current
+related:
+  - docs/README.md
+  - docs/runbook.md
+  - docs/roadmap.md
+---
+
 # Design — facts, info, deduction
 
 ## Two roots, one transaction
@@ -21,10 +30,13 @@ bin/brain/search.go "question"
   1. facts root   — confirmed answers only   → return with evidence links
   2. info  root   — supporting narrative     → snippets, marked (not confirmed)
   3. web-search   — second independent source → upgrade hypothesis to confirmed
+     (`web` block from `bin/web/search.go` when no facts hit; status `throttled`
+     is not evidence of absence; `--no-web` / `--root` skip it)
 ```
 
-`--hop` is not implemented yet (needs File/FROM_FILE edges). The flag is an
-error; it is not a graph walk.
+`--hop N` walks `Leaf-[:FROM_FILE]->File-[:HAS_VERSION]->Commit-[:AUTHORED]->Person`
+from each hit (1=File, 2=Commit, 3=Person). Rebuild writes FROM_FILE;
+git import writes HAS_VERSION/AUTHORED ([#17](https://git.produktor.io/eSlider/2dph/issues/17)).
 
 ## Who / What / How / Where / When + evidence
 
@@ -46,7 +58,8 @@ Every assertion edge carries:
 Content leafs: `sha256`, `observed_at`, `source_rev`, `confidence`. Stale = a
 file changed on disk (git HEAD/mtime) after its last observed `source_rev`.
 `File-[:HAS_VERSION]->Commit-[:AUTHORED]->Person` records the history of every
-content leaf.
+content leaf. Commit records come from `bin/git/import.go` (go-git, no git
+binary); conversion prints leafs, brain write is `bin/brain/index.go`.
 
 `bin/facts/audit stale` flags leafs whose observed revision is behind the
 corpus HEAD.
@@ -58,4 +71,34 @@ corpus HEAD.
 - C: narrative — READMEs, AGENTS.md, docs
 
 Confirmed = A×B or B×C agreement. Single source = hypothesis + `(not confirmed)`.
-Conflicting pairings (≥2 yes vs ≥2 no) = hypothesis (OQ1 → v2 resolution).
+Conflicting pairings (≥2 yes vs ≥2 no) = hypothesis (OQ1 → v2 resolution).
+
+## Read path
+
+`bin/brain/get.go`, `stats.go`, and `eval.go` call `internal/brain` with cgo
+(`system_ladybug`), compiled by **Zig** (`bin/cgo/zcc`, D21), not gcc.
+They do not exec Python. Control questions for recall@5 live in
+`internal/brain/rank` so CI can test the table without libladybug.
+Python `bin/kb/{get,stats,eval}` remain for GitHub Actions until the runner
+fetches Zig + libs (`bin/cgo/zig`). Incremental write is `bin/kb/add`
+(`bin/brain/add.go`). Bulk index/write is still `bin/kb/index`
+(`docker compose --profile index`).
+
+## Agent API (D20)
+
+`bin/brain/serve.go` exposes the same `internal/httpapi.Ops` table as OpenAPI
+(`GET /openapi.json`) and MCP (`POST /mcp` JSON-RPC `tools/list` +
+`tools/call`). Tool names match paths: `search`, `get`, `stats`, `audit`,
+`ingest` (add a leaf; omit body for the CLI hint).
+Agents should use these endpoints instead of shebang CLIs.
+
+## Reasoner (D18)
+
+Pluggable OpenAI-compatible URL. RAM: `Qwen/Qwen3.5-9B`. Quality:
+`prism-ml/Bonsai-27B-gguf` or `Qwen/Qwen3.6-27B`. No official Qwen3.6-9B.
+CPU sidecar: compose profile `reasoner` (`OLLAMA_NUM_GPU=0`,
+`127.0.0.1:11435`). Bake-off: `bin/reasoner/bakeoff.go`. Weights stay out
+of the 2dph image. See [docs/reasoner.md](reasoner.md).
+
+Gap to v1 (hops, corpus, CI eval): [roadmap](roadmap.md),
+[epic #16](https://git.produktor.io/eSlider/2dph/issues/16).

docs/picoclaw.md

@@ -0,0 +1,34 @@
+# PicoClaw profile (reference agent)
+
+2dph is the memory/fact gate. Compose profile `picoclaw` runs the official
+PicoClaw gateway (`docker.io/sipeed/picoclaw:v0.3.1`) plus `brain-mcp` and the
+CPU reasoner. Default agent model is `qwen3.5:9b` (RAM path, D18). Weights stay
+in the reasoner volume, not in the 2dph image.
+No secrets in git: Ollama needs no key; MCP is local HTTP.
+
+```bash
+docker compose --profile picoclaw up -d
+# already serving :8630 / :11435:
+docker compose --profile picoclaw up -d --no-deps picoclaw
+```
+
+Gateway: `127.0.0.1:18790`. Brain MCP: `http://127.0.0.1:8630/mcp`.
+Cursor-style clients can use [deploy/picoclaw/mcp.json.example](../deploy/picoclaw/mcp.json.example).
+PicoClaw itself uses [deploy/picoclaw/config.json](../deploy/picoclaw/config.json)
+(`127.0.0.1` + host network — loopback publishes are not reachable via docker0).
+
+OpenAPI: `GET http://127.0.0.1:8630/openapi.json`.
+
+Before a factual reply: `search` → `get` → `audit`. `throttled` is not a
+negative finding. See `skills/picoclaw/SKILL.md`.
+
+System performance (MCP gates + qwen3.5:9b tool_call + PicoClaw gateway):
+
+```bash
+./qa/system_perf.py --json | yq '.gates'
+REASONER_MODEL=qwen3.5:9b ./qa/system_perf.py --reasoner --picoclaw --json | yq '.reasoner'
+```
+
+The default agent model is `qwen3.5:9b`. PicoClaw `context_window` is 8192
+(heuristic `max_tokens*4` at 512 is 2048, too small for MCP tool schemas).
+`request_timeout` is 600s for a CPU turn (tool_call + MCP search + answer).

docs/reasoner.md

@@ -0,0 +1,71 @@
+# Reasoner bake-off (D18)
+
+Pluggable OpenAI-compatible URL. 2dph does not ship weights. PicoClaw is
+compose profile `picoclaw` (`sipeed/picoclaw`); the bake-off hits the same
+tool names (`search` → `get` → `audit` from `internal/httpapi.Ops`).
+
+```bash
+docker compose --profile reasoner up -d reasoner
+docker compose --profile reasoner exec reasoner ollama pull qwen3.5:9b
+REASONER_BASE_URL=http://127.0.0.1:11435/v1 REASONER_MODEL=qwen3.5:9b \
+  ./bin/reasoner/bakeoff.go --json
+```
+
+JSON includes `latency_p50_ms` / `latency_p95_ms` from DuckDB (`internal/duckstats`, D22).
+
+Host Ollama on `:11434` is left alone. This sidecar binds `127.0.0.1:11435`
+with `OLLAMA_NUM_GPU=0` (CPU). Measure RSS (`/api/ps` `size`), not VRAM.
+
+If Compose cannot allocate a project network (Docker IPAM pool exhausted),
+the same sidecar is:
+
+```bash
+docker run -d --name 2dph-reasoner \
+  -e OLLAMA_NUM_GPU=0 \
+  -p 127.0.0.1:11435:11434 \
+  -v 2dph-reasoner-ollama:/root/.ollama \
+  ollama/ollama:latest
+```
+
+## Real Hugging Face ids
+
+| Role | HF id | Ollama tag (this bake-off) |
+|------|-------|----------------------------|
+| RAM / 9B | `Qwen/Qwen3.5-9B` | `qwen3.5:9b` |
+| Quality 27B (CPU) | `prism-ml/Bonsai-27B-gguf` (derived from Qwen3.6-27B) | `MichelRosselli/bonsai-27b:Q1_0` |
+| Quality 27B (full) | `Qwen/Qwen3.6-27B` | not pulled on this CPU box |
+
+There is **no official Qwen3.6-9B**. Do not invent that id.
+
+Qwen3.5-9B has documented upstream tool-call XML bugs. A 9B win on tools
+is only claimed if this bake-off records OpenAI `tool_calls` (not
+`<tool_call>` XML in `content`).
+
+The 2dph API image does not `COPY` GGUF/safetensors. Pull at runtime into
+the `reasoner-ollama` volume.
+
+## Live CPU run
+
+Host sidecar: Ollama **0.32.9**, `OLLAMA_NUM_GPU=0`, `127.0.0.1:11435`,
+`device: cpu`, `vram_mb: 0`. Date: 2026-08-13. Same three prompts
+(`search` / `get` / `audit`). PicoClaw binary was not used; the OpenAI
+tools payload is the surface it would send.
+
+| Model | HF id | tool_call | xml_leak | rss_mb | latency_ms (search/get/audit) |
+|-------|-------|-----------|----------|--------|-------------------------------|
+| `qwen3.5:9b` | `Qwen/Qwen3.5-9B` | 3/3 | 0 | 5790 | 50059 / 51678 / 31980 |
+| `MichelRosselli/bonsai-27b:Q1_0` | `prism-ml/Bonsai-27B-gguf` | 3/3 | 0 | 21951 | 327702 / 166830 / 119808 |
+| `Qwen/Qwen3.6-27B` | `Qwen/Qwen3.6-27B` | not loaded | — | — | too heavy for this CPU box |
+
+Both loaded models emitted OpenAI `tool_calls` (not `<tool_call>` XML) on
+this runtime. **Do not claim 9B is better at tools** — the score is tied
+at 3/3. 9B is smaller and faster. Bonsai RSS includes weights + KV
+(`size` from `/api/ps`); first Bonsai prompt includes cold load.
+
+Re-run:
+
+```bash
+REASONER_BASE_URL=http://127.0.0.1:11435/v1 REASONER_MODEL=qwen3.5:9b \
+  ./bin/reasoner/bakeoff.go --json
+REASONER_MODEL=MichelRosselli/bonsai-27b:Q1_0 ./bin/reasoner/bakeoff.go --json
+```

docs/roadmap.md

@@ -0,0 +1,66 @@
+---
+type: explanation
+status: current
+related:
+  - PLAN.md
+  - docs/design.md
+  - docs/runbook.md
+---
+
+# Gap to v1 — detective brain
+
+Goal: a brain that does not assert without proof. Search is deduction
+(`facts` ≥2 sources → `info` → `web`). `confirmed` only from the facts root.
+
+**v1 is a living graph the agent can write and walk**, not “more RAG”.
+
+Epic: [Gitea #16](https://git.produktor.io/eSlider/2dph/issues/16).
+Milestone: [v1 detective brain](https://git.produktor.io/eSlider/2dph/milestone/12).
+Decisions: [PLAN.md](../PLAN.md).
+
+## In (do not reopen)
+
+Read path Go + Zig CGO (D21). HTTP + OpenAPI + MCP (D20). PicoClaw compose
+profile + CPU reasoner (D18). Mail sync → import → rebuild. D14 shebangs.
+Compose `api` (no CPython) / `index` (Python write). Issues #1–#5, #7–#13.
+[#15](https://git.produktor.io/eSlider/2dph/issues/15) lever/loop.
+[#14](https://git.produktor.io/eSlider/2dph/issues/14) `bin/brain/add.go` /
+`POST /ingest` (Python `kblib.add_leafs`; no Go upsert port).
+[#17](https://git.produktor.io/eSlider/2dph/issues/17) `--hop N` walks
+FROM_FILE / HAS_VERSION / AUTHORED.
+[#18](https://git.produktor.io/eSlider/2dph/issues/18) `--with-facts` /
+`--with-chats` on rebuild (WhatsApp out of v1).
+[#19](https://git.produktor.io/eSlider/2dph/issues/19) CI recall SoT =
+`bin/brain/eval.go` via Zig.
+Epic [#16](https://git.produktor.io/eSlider/2dph/issues/16) closed.
+
+## v2
+
+[#6](https://git.produktor.io/eSlider/2dph/issues/6) OCR — **in**.
+[#30](https://git.produktor.io/eSlider/2dph/issues/30) OQ3 duckdb-go — **in**.
+[#29](https://git.produktor.io/eSlider/2dph/issues/29) OQ1 contradiction
+resolution.
+
+## Blockers
+
+None for epic #16 (closed). Remaining v2: OQ1, OQ4.
+
+```
+question
+    │
+    ├─ FTS + HNSW          ← in
+    ├─ facts / info roots  ← in
+    ├─ web (D17)           ← in
+    ├─ brain/add ACID      ← in
+    ├─ Cypher hop          ← in
+    └─ facts+chats corpus  ← in
+```
+
+## Not v1
+
+OQ1 contradiction resolution, OQ4 YAML-first leafs.
+OCR (OQ2) and duckdb-go (OQ3/D22) are in.
+
+## Close epic #16 when
+
+Children #14, #15, #17, #18, #19 are closed. MCP tool order stays gated by tests.

docs/runbook.md

@@ -0,0 +1,85 @@
+---
+type: howto
+status: current
+related:
+  - docs/README.md
+  - PLAN.md
+---
+
+# Run 2dph (portable)
+
+No laptop-absolute paths. Config lives in env files under `$HOME/.config/brain/`
+(mode 0600), not in git.
+
+## Toolchain
+
+- Go (see `go.mod`)
+- Python 3.12 + [uv](https://docs.astral.sh/uv)
+- Optional: Docker, Zig CGO via `bin/cgo/zig` (not gcc)
+- Optional: poppler (`pdftotext`/`pdftoppm`) + tesseract `eng+deu` for mail OCR
+
+```bash
+uv venv .venv
+uv pip install -r requirements.lock.txt
+eval "$(bin/cgo/zig env)"   # when compiling Ladybug read tools
+go test ./...
+uv run python -m unittest discover -s bin/tools -t .
+```
+
+## Config
+
+| File / env | Purpose |
+|------------|---------|
+| `$BRAIN_SEARCH_ENV` (default `$HOME/.config/brain/search.env`) | `BRAIN_SEARCH_URL` (SearXNG). Optional Basic Auth. |
+| `$HOME/.config/brain/db-profiles.yml` | read-only Postgres profiles (OnlyOffice via tunnel) |
+
+If the host already runs SearXNG, point `BRAIN_SEARCH_URL` at it. Do not start
+a second copy (D3). Optional Compose instance:
+
+```bash
+SEARXNG_SECRET=$(openssl rand -hex 32) docker compose --profile searxng up -d
+```
+
+That binds `127.0.0.1:8888`. JSON format must stay enabled.
+
+## Index then search
+
+Write path is `bin/brain/add.go` for a leaf (or `POST /ingest`). Bulk
+corpus rebuild remains `bin/brain/index.go --rebuild` (Compose profile
+`index`). Do not DROP INDEX on Ladybug 0.19.
+
+```bash
+bin/brain/add.go --text "arc-1 runs Matrix" --root facts --source "compose.yml x docker ps"
+bin/brain/index.go --rebuild --with-facts --with-chats
+bin/brain/search.go "LadybugDB vector index"     # facts → info → web (D17)
+bin/brain/search.go "upstream flag" --no-web
+bin/brain/get.go <id> --body
+bin/brain/stats.go
+```
+
+`--hop N` walks File → Commit → Person from each hit. Empty web results are `throttled`, not absence.
+Gap to v1: [roadmap](roadmap.md) / [epic #16](https://git.produktor.io/eSlider/2dph/issues/16).
+
+Ladybug 0.19: never `DROP INDEX` FTS/VECTOR (ghost catalog). Fresh indexes =
+delete `var/kb.lbug` then `--rebuild`.
+
+## HTTP / MCP
+
+```bash
+docker compose up -d brain                       # :8630 Zig CGO serve
+docker compose --profile index run --rm index    # rebuild
+docker compose --profile picoclaw up brain-mcp   # MCP 127.0.0.1:8630
+```
+
+`GET /openapi.json`, `POST /mcp`. Agent tool order: `search` → `get` → `audit`.
+
+## Reasoner (optional, D18)
+
+CPU sidecar on `127.0.0.1:11435`. Weights are not in the 2dph image.
+
+```bash
+docker compose --profile reasoner up -d reasoner
+REASONER_BASE_URL=http://127.0.0.1:11435/v1 ./bin/reasoner/bakeoff.go --json
+```
+
+See [reasoner.md](reasoner.md).

go.mod

@@ -7,19 +7,54 @@ require (
 	github.com/arran4/golang-ical v0.3.5
 	github.com/chewxy/math32 v1.11.2
 	github.com/daulet/tokenizers v1.27.0
+	github.com/duckdb/duckdb-go/v2 v2.10505.0
+	github.com/go-git/go-git/v5 v5.19.2
+	golang.org/x/sys v0.47.0
 	golang.org/x/text v0.40.0
+	modernc.org/sqlite v1.56.0
 )
 
 require (
+	dario.cat/mergo v1.0.0 // indirect
+	github.com/Microsoft/go-winio v0.6.2 // indirect
+	github.com/ProtonMail/go-crypto v1.1.6 // indirect
 	github.com/apache/arrow-go/v18 v18.6.0 // indirect
+	github.com/cloudflare/circl v1.6.3 // indirect
+	github.com/cyphar/filepath-securejoin v0.6.1 // indirect
+	github.com/duckdb/duckdb-go-bindings v0.10505.0 // indirect
+	github.com/duckdb/duckdb-go-bindings/lib/darwin-amd64 v0.10505.0 // indirect
+	github.com/duckdb/duckdb-go-bindings/lib/darwin-arm64 v0.10505.0 // indirect
+	github.com/duckdb/duckdb-go-bindings/lib/linux-amd64 v0.10505.0 // indirect
+	github.com/duckdb/duckdb-go-bindings/lib/linux-arm64 v0.10505.0 // indirect
+	github.com/duckdb/duckdb-go-bindings/lib/windows-amd64 v0.10505.0 // indirect
+	github.com/dustin/go-humanize v1.0.1 // indirect
+	github.com/emirpasic/gods v1.18.1 // indirect
+	github.com/go-git/gcfg v1.5.1-0.20230307220236-3a3c6141e376 // indirect
+	github.com/go-git/go-billy/v5 v5.9.0 // indirect
+	github.com/go-viper/mapstructure/v2 v2.5.0 // indirect
 	github.com/goccy/go-json v0.10.6 // indirect
+	github.com/golang/groupcache v0.0.0-20241129210726-2c02b8208cf8 // indirect
 	github.com/google/flatbuffers v25.12.19+incompatible // indirect
 	github.com/google/uuid v1.6.0 // indirect
+	github.com/jbenet/go-context v0.0.0-20150711004518-d14ea06fba99 // indirect
+	github.com/kevinburke/ssh_config v1.2.0 // indirect
 	github.com/klauspost/compress v1.18.5 // indirect
 	github.com/klauspost/cpuid/v2 v2.3.0 // indirect
+	github.com/mattn/go-isatty v0.0.24 // indirect
+	github.com/ncruces/go-strftime v1.0.0 // indirect
 	github.com/pierrec/lz4/v4 v4.1.26 // indirect
+	github.com/pjbgf/sha1cd v0.6.0 // indirect
+	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
+	github.com/sergi/go-diff v1.3.2-0.20230802210424-5b0b94c5c0d3 // indirect
 	github.com/shopspring/decimal v1.4.0 // indirect
+	github.com/skeema/knownhosts v1.3.1 // indirect
+	github.com/xanzy/ssh-agent v0.3.3 // indirect
 	github.com/zeebo/xxh3 v1.1.0 // indirect
-	golang.org/x/exp v0.0.0-20260112195511-716be5621a96 // indirect
-	golang.org/x/sys v0.43.0 // indirect
+	golang.org/x/crypto v0.53.0 // indirect
+	golang.org/x/exp v0.0.0-20260410095643-746e56fc9e2f // indirect
+	golang.org/x/net v0.56.0 // indirect
+	gopkg.in/warnings.v0 v0.1.2 // indirect
+	modernc.org/libc v1.74.4 // indirect
+	modernc.org/mathutil v1.7.1 // indirect
+	modernc.org/memory v1.11.0 // indirect
 )

go.sum

@@ -1,50 +1,200 @@
+dario.cat/mergo v1.0.0 h1:AGCNq9Evsj31mOgNPcLyXc+4PNABt905YmuqPYYpBWk=
+dario.cat/mergo v1.0.0/go.mod h1:uNxQE+84aUszobStD9th8a29P2fMDhsBdgRYvZOxGmk=
 github.com/LadybugDB/go-ladybug v0.17.0 h1:RXDbkBjrbRmLdEbhGl4CLOIEzSt09gbP0n9UbKDEfwI=
 github.com/LadybugDB/go-ladybug v0.17.0/go.mod h1:GeIXmE8XyF5TFS94NAuTag7vgCC+no/HTBMRA6Rd5Cs=
+github.com/Microsoft/go-winio v0.5.2/go.mod h1:WpS1mjBmmwHBEWmogvA2mj8546UReBk4v8QkMxJ6pZY=
+github.com/Microsoft/go-winio v0.6.2 h1:F2VQgta7ecxGYO8k3ZZz3RS8fVIXVxONVUPlNERoyfY=
+github.com/Microsoft/go-winio v0.6.2/go.mod h1:yd8OoFMLzJbo9gZq8j5qaps8bJ9aShtEA8Ipt1oGCvU=
+github.com/ProtonMail/go-crypto v1.1.6 h1:ZcV+Ropw6Qn0AX9brlQLAUXfqLBc7Bl+f/DmNxpLfdw=
+github.com/ProtonMail/go-crypto v1.1.6/go.mod h1:rA3QumHc/FZ8pAHreoekgiAbzpNsfQAosU5td4SnOrE=
 github.com/andybalholm/brotli v1.2.1 h1:R+f5xP285VArJDRgowrfb9DqL18yVK0gKAW/F+eTWro=
 github.com/andybalholm/brotli v1.2.1/go.mod h1:rzTDkvFWvIrjDXZHkuS16NPggd91W3kUSvPlQ1pLaKY=
+github.com/anmitsu/go-shlex v0.0.0-20200514113438-38f4b401e2be h1:9AeTilPcZAjCFIImctFaOjnTIavg87rW78vTPkQqLI8=
+github.com/anmitsu/go-shlex v0.0.0-20200514113438-38f4b401e2be/go.mod h1:ySMOLuWl6zY27l47sB3qLNK6tF2fkHG55UZxx8oIVo4=
 github.com/apache/arrow-go/v18 v18.6.0 h1:GX/Jyd3R7mCLiECAwY9FWbbaYblie2WXBSz4Sw8fNpM=
 github.com/apache/arrow-go/v18 v18.6.0/go.mod h1:gm3MiPpY82fLYK5VKPB3WoJbsiLVDfT7flD5/vHReKw=
 github.com/apache/thrift v0.22.0 h1:r7mTJdj51TMDe6RtcmNdQxgn9XcyfGDOzegMDRg47uc=
 github.com/apache/thrift v0.22.0/go.mod h1:1e7J/O1Ae6ZQMTYdy9xa3w9k+XHWPfRvdPyJeynQ+/g=
+github.com/armon/go-socks5 v0.0.0-20160902184237-e75332964ef5 h1:0CwZNZbxp69SHPdPJAN/hZIm0C4OItdklCFmMRWYpio=
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 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
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internal/brain/http.go

@@ -0,0 +1,171 @@
+//go:build cgo && system_ladybug
+
+package brain
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"os/exec"
+	"path/filepath"
+
+	"github.com/eSlider/2dph/internal/brain/rank"
+)
+
+// Ready opens the Ladybug file for the life of the serve process.
+func Ready() error {
+	return openBrain()
+}
+
+// HTTP is the in-process API used by bin/brain/serve.go.
+type HTTP struct{}
+
+func (HTTP) Search(ctx context.Context, query string, limit int) ([]byte, error) {
+	hits, err := searchHits(query, "", "", limit)
+	if err != nil {
+		return nil, err
+	}
+	for i := range hits {
+		if hits[i].Text != "" {
+			runes := []rune(hits[i].Text)
+			if len(runes) > 280 {
+				runes = runes[:280]
+			}
+			hits[i].Snippet = string(runes)
+		}
+	}
+	webOut := rank.Deduce(hits, query, "", false, func(q string) rank.SecondSource {
+		return lookupWeb(ctx, q)
+	})
+	var buf bytes.Buffer
+	enc := json.NewEncoder(&buf)
+	enc.SetEscapeHTML(false)
+	if err := enc.Encode(toJSONOut(hits, query, "", webOut)); err != nil {
+		return nil, err
+	}
+	return buf.Bytes(), nil
+}
+
+func (HTTP) Get(_ context.Context, id string, body bool) ([]byte, error) {
+	if conn == nil {
+		return nil, fmt.Errorf("brain not open")
+	}
+	stmt, err := conn.Prepare(
+		"MATCH (l:Leaf {id:$id}) RETURN l.id, l.text, l.root, l.confidence, l.source, l.type",
+	)
+	if err != nil {
+		return nil, err
+	}
+	defer stmt.Close()
+	res, err := conn.Execute(stmt, map[string]any{"id": id})
+	if err != nil {
+		return nil, err
+	}
+	if !res.HasNext() {
+		return nil, fmt.Errorf("no leaf %s", id)
+	}
+	row, err := res.Next()
+	if err != nil {
+		return nil, err
+	}
+	vals, err := row.GetAsSlice()
+	if err != nil || len(vals) < 6 {
+		return nil, fmt.Errorf("leaf row")
+	}
+	out := map[string]any{
+		"id":         fmt.Sprint(vals[0]),
+		"root":       fmt.Sprint(vals[2]),
+		"confidence": fmt.Sprint(vals[3]),
+		"source":     fmt.Sprint(vals[4]),
+		"type":       fmt.Sprint(vals[5]),
+	}
+	if body {
+		out["text"] = fmt.Sprint(vals[1])
+	}
+	return json.Marshal(out)
+}
+
+func (HTTP) Stats(context.Context) ([]byte, error) {
+	if conn == nil {
+		return nil, fmt.Errorf("brain not open")
+	}
+	res, err := conn.Query("MATCH (l:Leaf) RETURN l.root, count(*)")
+	if err != nil {
+		return nil, err
+	}
+	byRoot := map[string]int{}
+	total := 0
+	for res.HasNext() {
+		row, err := res.Next()
+		if err != nil {
+			return nil, err
+		}
+		vals, err := row.GetAsSlice()
+		if err != nil || len(vals) < 2 {
+			continue
+		}
+		n := int(asInt(vals[1]))
+		byRoot[fmt.Sprint(vals[0])] = n
+		total += n
+	}
+	return json.Marshal(map[string]any{"total": total, "by_root": byRoot, "db": dbPath()})
+}
+
+func (HTTP) Audit(context.Context) ([]byte, error) {
+	if conn == nil {
+		return nil, fmt.Errorf("brain not open")
+	}
+	res, err := conn.Query("MATCH (l:Leaf) RETURN l.root, l.confidence, count(*)")
+	if err != nil {
+		return nil, err
+	}
+	var rows []map[string]any
+	for res.HasNext() {
+		row, err := res.Next()
+		if err != nil {
+			return nil, err
+		}
+		vals, err := row.GetAsSlice()
+		if err != nil || len(vals) < 3 {
+			continue
+		}
+		rows = append(rows, map[string]any{
+			"root":       fmt.Sprint(vals[0]),
+			"confidence": fmt.Sprint(vals[1]),
+			"count":      asInt(vals[2]),
+		})
+	}
+	return json.Marshal(map[string]any{"status": "ok", "by_confidence": rows})
+}
+
+func (HTTP) Ingest(ctx context.Context, body []byte) ([]byte, error) {
+	if len(bytes.TrimSpace(body)) == 0 {
+		return json.Marshal(map[string]any{
+			"mode":    "add",
+			"command": "bin/brain/add.go",
+			"rebuild": "bin/brain/index.go --rebuild",
+		})
+	}
+	cmd := exec.CommandContext(ctx, filepath.Join(repoRoot(), "bin", "kb", "add"), "--json")
+	cmd.Stdin = bytes.NewReader(body)
+	cmd.Dir = repoRoot()
+	out, err := cmd.Output()
+	if err != nil {
+		return nil, fmt.Errorf("add: %w", err)
+	}
+	return out, nil
+}
+
+func asInt(v any) int64 {
+	switch n := v.(type) {
+	case int64:
+		return n
+	case int:
+		return int64(n)
+	case float64:
+		return int64(n)
+	default:
+		return 0
+	}
+}

internal/brain/modelid.go

@@ -0,0 +1,3 @@
+package brain
+
+const ModelID = "minishlab/potion-multilingual-128M"

internal/brain/rank/args.go

@@ -6,7 +6,7 @@ import (
 	"strings"
 )
 
-const Usage = `usage: bin/brain/search.go "query" [--root facts|info] [--repo REPO] [-n N] [--json]
+const Usage = `usage: bin/brain/search.go "query" [--root facts|info] [--repo REPO] [-n N] [--hop N] [--json] [--no-web]
        bin/brain/search.go serve [port]
        bin/brain/search.go --list-model`
 
@@ -15,14 +15,14 @@ type Options struct {
 	Root      string
 	Repo      string
 	Limit     int
+	Hop       int
 	JSONOut   bool
 	ListModel bool
+	NoWeb     bool
 }
 
 // ParseArgs reads flags. Unknown flags are an error: silently dropping them
 // meant `--hop 1` vanished and its argument `1` was appended to the query.
-// --hop is recognised so it cannot be swallowed; it is not implemented until
-// File/FROM_FILE edges exist.
 func ParseArgs(args []string) (Options, error) {
 	opt := Options{Limit: 20}
 	var queryArgs []string
@@ -51,9 +51,19 @@ func ParseArgs(args []string) (Options, error) {
 			}
 			opt.Limit = n
 		case "--hop":
-			return opt, fmt.Errorf("--hop is not implemented yet (needs File/FROM_FILE edges)")
+			i++
+			n, err := strconv.Atoi(args[i])
+			if err != nil || n < 1 {
+				return opt, fmt.Errorf("--hop must be a positive integer, got %q", args[i])
+			}
+			if n > 3 {
+				return opt, fmt.Errorf("--hop max is 3 (File → Commit → Person)")
+			}
+			opt.Hop = n
 		case "--json":
 			opt.JSONOut = true
+		case "--no-web":
+			opt.NoWeb = true
 		case "--list-model":
 			opt.ListModel = true
 		default:

internal/brain/rank/escalate.go

@@ -0,0 +1,43 @@
+package rank
+
+// SecondSource is the web-search block on a deduction answer.
+// Kept apart from graph hits so "ours" and "not ours" stay visible.
+type SecondSource struct {
+	Status  string            `json:"status"`
+	Note    string            `json:"note,omitempty"`
+	Cached  bool              `json:"cached,omitempty"`
+	Results []SecondSourceHit `json:"results,omitempty"`
+}
+
+type SecondSourceHit struct {
+	Rank    int    `json:"rank"`
+	Title   string `json:"title"`
+	URL     string `json:"url"`
+	Snippet string `json:"snippet"`
+	Engine  string `json:"engine"`
+}
+
+type WebFn func(query string) SecondSource
+
+// ShouldEscalate is true when the default deduction path has no facts hit.
+// `--root facts|info` is a single-root ask: do not mix in the web.
+func ShouldEscalate(hits []Hit, rootFilter string) bool {
+	if rootFilter != "" {
+		return false
+	}
+	for _, h := range hits {
+		if h.Root == "facts" {
+			return false
+		}
+	}
+	return true
+}
+
+// Deduce returns the second-source block, or nil when web must not run.
+func Deduce(hits []Hit, query, rootFilter string, noWeb bool, web WebFn) *SecondSource {
+	if noWeb || web == nil || !ShouldEscalate(hits, rootFilter) {
+		return nil
+	}
+	out := web(query)
+	return &out
+}

internal/brain/rank/escalate_test.go

@@ -0,0 +1,78 @@
+package rank
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestShouldEscalateWhenNoFacts(t *testing.T) {
+	if !ShouldEscalate(nil, "") {
+		t.Fatal("empty local graph must escalate")
+	}
+	if !ShouldEscalate([]Hit{h("i", "info", "docs/a.md")}, "") {
+		t.Fatal("info-only must escalate (not confirmed)")
+	}
+}
+
+func TestShouldNotEscalateWhenFactsConfirm(t *testing.T) {
+	hits := []Hit{h("f", "facts", "docker ps x compose"), h("i", "info", "docs/a.md")}
+	if ShouldEscalate(hits, "") {
+		t.Fatal("facts hit is already confirmed; do not mix web")
+	}
+}
+
+func TestShouldNotEscalateWhenRootFilterSet(t *testing.T) {
+	if ShouldEscalate(nil, "facts") {
+		t.Fatal("--root facts must stay local")
+	}
+	if ShouldEscalate([]Hit{h("i", "info", "x")}, "info") {
+		t.Fatal("--root info must stay local")
+	}
+}
+
+func TestDeduceCallsWebOnlyWhenEscalating(t *testing.T) {
+	called := 0
+	web := func(q string) SecondSource {
+		called++
+		if q != "LadybugDB" {
+			t.Fatalf("query = %q", q)
+		}
+		return SecondSource{Status: "ok", Results: []SecondSourceHit{{Title: "t", URL: "http://example.com"}}}
+	}
+	got := Deduce([]Hit{h("i", "info", "x")}, "LadybugDB", "", false, web)
+	if called != 1 || got == nil || got.Status != "ok" {
+		t.Fatalf("got %+v called=%d", got, called)
+	}
+}
+
+func TestDeduceNilWhenFactsOrNoWeb(t *testing.T) {
+	web := func(string) SecondSource {
+		t.Fatal("web must not run")
+		return SecondSource{}
+	}
+	if Deduce([]Hit{h("f", "facts", "x")}, "q", "", false, web) != nil {
+		t.Fatal("facts")
+	}
+	if Deduce([]Hit{h("i", "info", "x")}, "q", "", true, web) != nil {
+		t.Fatal("--no-web")
+	}
+	if Deduce(nil, "q", "facts", false, web) != nil {
+		t.Fatal("--root facts")
+	}
+	if Deduce(nil, "q", "", false, nil) != nil {
+		t.Fatal("nil web fn")
+	}
+}
+
+func TestParseNoWeb(t *testing.T) {
+	opt, err := ParseArgs([]string{"query", "--no-web", "--json"})
+	if err != nil || !opt.NoWeb || !opt.JSONOut || opt.Query != "query" {
+		t.Fatalf("got %+v err=%v", opt, err)
+	}
+}
+
+func TestUsageNamesNoWeb(t *testing.T) {
+	if !strings.Contains(Usage, "--no-web") {
+		t.Fatalf("usage must name --no-web, got:\n%s", Usage)
+	}
+}

internal/brain/rank/evalq.go

@@ -0,0 +1,16 @@
+package rank
+
+// Eval control questions (recall@5). Kept here so CI can test the gate
+// table without ladybug cgo. The runner lives in internal/brain (cgo).
+const EvalRecallThreshold = 0.95
+
+type EvalQuestion struct {
+	Query    string
+	Fragment string
+}
+
+var EvalQuestions = []EvalQuestion{
+	{"hybrid search fts and vector", "BM25"},
+	{"eslider devops engineer", "DevOps"},
+	{"ladybugdb graph engine storage", "LadybugDB"},
+}

internal/brain/rank/evalq_test.go

@@ -0,0 +1,17 @@
+package rank
+
+import "testing"
+
+func TestEvalQuestionsAreThreeAndThreshold(t *testing.T) {
+	if EvalRecallThreshold != 0.95 {
+		t.Fatalf("threshold = %v", EvalRecallThreshold)
+	}
+	if len(EvalQuestions) != 3 {
+		t.Fatalf("questions = %d, want 3", len(EvalQuestions))
+	}
+	for _, q := range EvalQuestions {
+		if q.Query == "" || q.Fragment == "" {
+			t.Fatalf("empty control: %+v", q)
+		}
+	}
+}

internal/brain/rank/query.go

@@ -7,3 +7,30 @@ const FTSStmt = "CALL QUERY_FTS_INDEX('Leaf', 'id', $q) " +
 
 const VecStmt = "CALL QUERY_VECTOR_INDEX('Leaf', 'Leaf_vec', $q, $n) " +
 	"RETURN node.id, node.text, node.root, node.source, distance ORDER BY distance LIMIT $n"
+
+// HopStmt is the Cypher walk from a search hit. Depth 1 = File, 2 = Commit, 3 = Person.
+func HopStmt(depth int) string {
+	switch depth {
+	case 1:
+		return "MATCH (l:Leaf {id:$id})-[:FROM_FILE]->(f:File) RETURN f.id, f.path, 1"
+	case 2:
+		return "MATCH (l:Leaf {id:$id})-[:FROM_FILE]->(f:File)-[:HAS_VERSION]->(c:Commit) RETURN c.id, c.subject, 2"
+	case 3:
+		return "MATCH (l:Leaf {id:$id})-[:FROM_FILE]->(f:File)-[:HAS_VERSION]->(c:Commit)-[:AUTHORED]->(p:Person) RETURN p.id, p.name, 3"
+	default:
+		return ""
+	}
+}
+
+func HopLabel(depth int) string {
+	switch depth {
+	case 1:
+		return "File"
+	case 2:
+		return "Commit"
+	case 3:
+		return "Person"
+	default:
+		return ""
+	}
+}

internal/brain/rank/rank.go

@@ -7,14 +7,22 @@ import (
 	"strings"
 )
 
+type HopNode struct {
+	ID    string `json:"id"`
+	Label string `json:"label"`
+	Name  string `json:"name"`
+	Depth int    `json:"depth"`
+}
+
 // Hit is one search result, mirroring the python script's dict shape.
 type Hit struct {
-	ID      string  `json:"id"`
-	Text    string  `json:"text"`
-	Root    string  `json:"root"`
-	Source  string  `json:"-"`
-	Score   float64 `json:"score"`
-	Snippet string  `json:"snippet,omitempty"`
+	ID      string    `json:"id"`
+	Text    string    `json:"text"`
+	Root    string    `json:"root"`
+	Source  string    `json:"-"`
+	Score   float64   `json:"score"`
+	Snippet string    `json:"snippet,omitempty"`
+	Hops    []HopNode `json:"hops,omitempty"`
 }
 
 // rrfK dampens the contribution of low ranks; same constant as kblib.py.

internal/brain/rank/rank_test.go

@@ -91,15 +91,41 @@ func TestHybridKeepsVectorScoreForSharedHit(t *testing.T) {
 }
 
 // The old parser dropped unknown flags and appended their arguments to the
-// query, so `search "q" --hop 1` searched for "q 1". --hop is not implemented
-// here (needs File edges); it must still fail closed instead of changing q.
+// query, so `search "q" --hop 1` searched for "q 1". --hop must stay a flag.
 func TestParseHopIsNotSwallowedIntoTheQuery(t *testing.T) {
-	_, err := ParseArgs([]string{"what runs on arc-2", "--hop", "1"})
-	if err == nil {
-		t.Fatal("expected --hop to error (not implemented), not be swallowed")
+	opt, err := ParseArgs([]string{"what runs on arc-2", "--hop", "1"})
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
 	}
-	if !strings.Contains(err.Error(), "--hop") {
-		t.Fatalf("error should name --hop, got %v", err)
+	if opt.Query != "what runs on arc-2" {
+		t.Fatalf("query swallowed hop arg: %q", opt.Query)
+	}
+	if opt.Hop != 1 {
+		t.Fatalf("hop = %d, want 1", opt.Hop)
+	}
+}
+
+func TestParseHopMaxIsThree(t *testing.T) {
+	if _, err := ParseArgs([]string{"q", "--hop", "4"}); err == nil {
+		t.Fatal("expected --hop 4 to error")
+	}
+	opt, err := ParseArgs([]string{"q", "--hop", "3"})
+	if err != nil || opt.Hop != 3 {
+		t.Fatalf("hop 3: %+v err=%v", opt, err)
+	}
+}
+
+func TestHopStmtWalksFromFile(t *testing.T) {
+	s := HopStmt(1)
+	if !strings.Contains(s, "FROM_FILE") || !strings.Contains(s, "File") {
+		t.Fatalf("hop 1 must walk FROM_FILE, got %q", s)
+	}
+	s3 := HopStmt(3)
+	if !strings.Contains(s3, "HAS_VERSION") || !strings.Contains(s3, "AUTHORED") || !strings.Contains(s3, "Person") {
+		t.Fatalf("hop 3 must reach Person, got %q", s3)
+	}
+	if HopLabel(1) != "File" || HopLabel(3) != "Person" {
+		t.Fatal("hop labels")
 	}
 }
 

internal/brain/read.go

@@ -0,0 +1,281 @@
+//go:build cgo && system_ladybug
+
+package brain
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"sort"
+	"strings"
+	"unicode/utf8"
+
+	"github.com/eSlider/2dph/internal/brain/rank"
+)
+
+func MainGet(args []string) int {
+	id, body, jsonOut := "", false, false
+	for _, a := range args {
+		switch {
+		case a == "--body":
+			body = true
+		case a == "--json":
+			jsonOut = true
+		case a == "-h" || a == "--help":
+			fmt.Fprintln(os.Stderr, `usage: bin/brain/get.go <id> [--body] [--json]`)
+			return 0
+		case strings.HasPrefix(a, "-"):
+			fmt.Fprintf(os.Stderr, "brain/get: unknown flag %s\n", a)
+			return 2
+		default:
+			id = a
+		}
+	}
+	if id == "" {
+		fmt.Fprintln(os.Stderr, "brain/get: id required")
+		return 2
+	}
+	if err := openBrain(); err != nil {
+		fmt.Fprintf(os.Stderr, "open brain: %v\n", err)
+		return 1
+	}
+	defer closeBrain()
+	meta, text, err := lookupLeaf(id)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "brain/get: %v\n", err)
+		return 1
+	}
+	out := Dict{
+		{"id", meta["id"]},
+		{"root", meta["root"]},
+		{"confidence", meta["confidence"]},
+		{"source", meta["source"]},
+		{"type", meta["type"]},
+	}
+	if body {
+		out = append(out, KV{"text", text})
+	} else {
+		out = append(out, KV{"snippet", clip(text, 280)})
+	}
+	if jsonOut {
+		m := map[string]any{}
+		for _, kv := range out {
+			m[kv.K] = kv.V
+		}
+		enc := json.NewEncoder(os.Stdout)
+		enc.SetIndent("", "  ")
+		enc.SetEscapeHTML(false)
+		return b2i(enc.Encode(m))
+	}
+	fmt.Print(toYAML(out, 0))
+	return 0
+}
+
+func MainStats(args []string) int {
+	jsonOut := false
+	for _, a := range args {
+		switch a {
+		case "--json":
+			jsonOut = true
+		case "-h", "--help":
+			fmt.Fprintln(os.Stderr, `usage: bin/brain/stats.go [--json]`)
+			return 0
+		default:
+			if strings.HasPrefix(a, "-") {
+				fmt.Fprintf(os.Stderr, "brain/stats: unknown flag %s\n", a)
+				return 2
+			}
+		}
+	}
+	if err := openBrain(); err != nil {
+		fmt.Fprintf(os.Stderr, "open brain: %v\n", err)
+		return 1
+	}
+	defer closeBrain()
+	s, err := leafStats()
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "brain/stats: %v\n", err)
+		return 1
+	}
+	if jsonOut {
+		enc := json.NewEncoder(os.Stdout)
+		enc.SetIndent("", "  ")
+		enc.SetEscapeHTML(false)
+		return b2i(enc.Encode(s))
+	}
+	by := s["by_root"].(map[string]int)
+	keys := make([]string, 0, len(by))
+	for k := range by {
+		keys = append(keys, k)
+	}
+	sort.Strings(keys)
+	byRoot := make(Dict, 0, len(keys))
+	for _, k := range keys {
+		byRoot = append(byRoot, KV{k, by[k]})
+	}
+	out := Dict{
+		{"total", s["total"]},
+		{"by_root", byRoot},
+		{"db", s["db"]},
+		{"model", s["model"]},
+	}
+	fmt.Print(toYAML(out, 0))
+	return 0
+}
+
+func MainEval(args []string) int {
+	jsonOut := false
+	for _, a := range args {
+		switch a {
+		case "--json":
+			jsonOut = true
+		case "-h", "--help":
+			fmt.Fprintln(os.Stderr, `usage: bin/brain/eval.go [--json]`)
+			return 0
+		default:
+			if strings.HasPrefix(a, "-") {
+				fmt.Fprintf(os.Stderr, "brain/eval: unknown flag %s\n", a)
+				return 2
+			}
+		}
+	}
+	if err := openBrain(); err != nil {
+		fmt.Fprintf(os.Stderr, "open brain: %v\n", err)
+		return 1
+	}
+	defer closeBrain()
+	recalled := 0
+	details := make([]any, 0, len(rank.EvalQuestions))
+	jsDetails := make([]map[string]any, 0, len(rank.EvalQuestions))
+	for _, q := range rank.EvalQuestions {
+		hits, err := queryFTS(q.Query, 5)
+		ok := false
+		if err == nil {
+			frag := strings.ToLower(q.Fragment)
+			for _, h := range hits {
+				if strings.Contains(strings.ToLower(h.Text), frag) {
+					ok = true
+					break
+				}
+			}
+		}
+		if ok {
+			recalled++
+		}
+		details = append(details, Dict{
+			{"q", q.Query},
+			{"fragment", q.Fragment},
+			{"in_top5", ok},
+		})
+		jsDetails = append(jsDetails, map[string]any{
+			"q": q.Query, "fragment": q.Fragment, "in_top5": ok,
+		})
+	}
+	n := len(rank.EvalQuestions)
+	recall := 0.0
+	if n > 0 {
+		recall = float64(recalled) / float64(n)
+	}
+	passed := recall >= rank.EvalRecallThreshold
+	if jsonOut {
+		enc := json.NewEncoder(os.Stdout)
+		enc.SetIndent("", "  ")
+		enc.SetEscapeHTML(false)
+		_ = enc.Encode(map[string]any{
+			"recall@5": round3(recall),
+			"passed":   passed,
+			"gate":     n,
+			"details":  jsDetails,
+		})
+	} else {
+		out := Dict{
+			{"recall@5", round3(recall)},
+			{"passed", passed},
+			{"gate", n},
+			{"details", details},
+		}
+		fmt.Print(toYAML(out, 0))
+	}
+	if !passed {
+		return 2
+	}
+	return 0
+}
+
+func lookupLeaf(id string) (map[string]string, string, error) {
+	if conn == nil {
+		return nil, "", fmt.Errorf("brain not open")
+	}
+	stmt, err := conn.Prepare(
+		"MATCH (l:Leaf {id:$id}) RETURN l.id, l.text, l.root, l.confidence, l.source, l.type",
+	)
+	if err != nil {
+		return nil, "", err
+	}
+	defer stmt.Close()
+	res, err := conn.Execute(stmt, map[string]any{"id": id})
+	if err != nil {
+		return nil, "", err
+	}
+	if !res.HasNext() {
+		return nil, "", fmt.Errorf("no leaf %s", id)
+	}
+	row, err := res.Next()
+	if err != nil {
+		return nil, "", err
+	}
+	vals, err := row.GetAsSlice()
+	if err != nil || len(vals) < 6 {
+		return nil, "", fmt.Errorf("leaf row")
+	}
+	meta := map[string]string{
+		"id":         fmt.Sprint(vals[0]),
+		"root":       fmt.Sprint(vals[2]),
+		"confidence": fmt.Sprint(vals[3]),
+		"source":     fmt.Sprint(vals[4]),
+		"type":       fmt.Sprint(vals[5]),
+	}
+	return meta, fmt.Sprint(vals[1]), nil
+}
+
+func leafStats() (map[string]any, error) {
+	if conn == nil {
+		return nil, fmt.Errorf("brain not open")
+	}
+	res, err := conn.Query("MATCH (l:Leaf) RETURN l.root, count(*)")
+	if err != nil {
+		return nil, err
+	}
+	byRoot := map[string]int{}
+	total := 0
+	for res.HasNext() {
+		row, err := res.Next()
+		if err != nil {
+			return nil, err
+		}
+		vals, err := row.GetAsSlice()
+		if err != nil || len(vals) < 2 {
+			continue
+		}
+		n := int(asInt(vals[1]))
+		byRoot[fmt.Sprint(vals[0])] = n
+		total += n
+	}
+	return map[string]any{
+		"total":   total,
+		"by_root": byRoot,
+		"db":      dbPath(),
+		"model":   ModelID,
+	}, nil
+}
+
+func clip(s string, n int) string {
+	if utf8.RuneCountInString(s) <= n {
+		return s
+	}
+	return string([]rune(s)[:n])
+}
+
+func round3(f float64) float64 {
+	return float64(int(f*1000+0.5)) / 1000
+}

internal/brain/search.go

@@ -51,25 +51,19 @@ func runSearch(args []string) int {
 	}
 	defer closeBrain()
 
-	emb, err := embedQuery(query)
+	hits, err := searchHits(query, root, repo, limit)
 	if err != nil {
-		fmt.Fprintf(os.Stderr, "embed: %v\n", err)
+		fmt.Fprintf(os.Stderr, "search: %v\n", err)
 		return 1
 	}
-
-	fts, err := queryFTS(query, limit*3)
-	if err != nil {
-		fmt.Fprintf(os.Stderr, "fts: %v\n", err)
-		return 1
+	if opt.Hop > 0 {
+		if err := attachHops(hits, opt.Hop); err != nil {
+			fmt.Fprintf(os.Stderr, "hop: %v\n", err)
+			return 1
+		}
 	}
 
-	var vec []Hit
-	if vec, err = queryVector(emb, limit*3); err != nil {
-		fmt.Fprintf(os.Stderr, "vec: %v\n", err)
-	}
-
-	results := rank.RankAndFilter(fts, vec, root, repo, limit)
-
+	results := hits
 	for i := range results {
 		if results[i].Text != "" {
 			runes := []rune(results[i].Text)
@@ -80,23 +74,84 @@ func runSearch(args []string) int {
 		}
 	}
 
+	webOut := rank.Deduce(results, query, root, opt.NoWeb, func(q string) rank.SecondSource {
+		return lookupWeb(context.Background(), q)
+	})
+
 	out := Dict{
 		{"query", query},
 		{"root_filter", root},
 		{"count", len(results)},
 		{"results", resultsToDicts(results)},
 	}
+	if webOut != nil {
+		out = append(out, KV{"web", secondToDict(*webOut)})
+	}
 
 	if jsonOut {
 		enc := json.NewEncoder(os.Stdout)
 		enc.SetIndent("", "  ")
 		enc.SetEscapeHTML(false)
-		return b2i(enc.Encode(toJSONOut(results, query, root)))
+		return b2i(enc.Encode(toJSONOut(results, query, root, webOut)))
 	}
 	fmt.Print(toYAML(out, 0))
 	return 0
 }
 
+func searchHits(query, root, repo string, limit int) ([]Hit, error) {
+	emb, err := embedQuery(query)
+	if err != nil {
+		return nil, fmt.Errorf("embed: %w", err)
+	}
+	fts, err := queryFTS(query, limit*3)
+	if err != nil {
+		return nil, fmt.Errorf("fts: %w", err)
+	}
+	var vec []Hit
+	if vec, err = queryVector(emb, limit*3); err != nil {
+		fmt.Fprintf(os.Stderr, "vec: %v\n", err)
+	}
+	return rank.RankAndFilter(fts, vec, root, repo, limit), nil
+}
+
+func attachHops(hits []Hit, n int) error {
+	if conn == nil {
+		return fmt.Errorf("brain not open")
+	}
+	for i := range hits {
+		var hops []rank.HopNode
+		for d := 1; d <= n; d++ {
+			stmt, err := conn.Prepare(rank.HopStmt(d))
+			if err != nil {
+				return err
+			}
+			res, err := conn.Execute(stmt, map[string]any{"id": hits[i].ID})
+			stmt.Close()
+			if err != nil {
+				return err
+			}
+			for res.HasNext() {
+				row, err := res.Next()
+				if err != nil {
+					return err
+				}
+				vals, err := row.GetAsSlice()
+				if err != nil || len(vals) < 3 {
+					continue
+				}
+				hops = append(hops, rank.HopNode{
+					ID:    fmt.Sprint(vals[0]),
+					Label: rank.HopLabel(d),
+					Name:  fmt.Sprint(vals[1]),
+					Depth: int(asInt(vals[2])),
+				})
+			}
+		}
+		hits[i].Hops = hops
+	}
+	return nil
+}
+
 func b2i(err error) int {
 	if err != nil {
 		return 1
@@ -164,21 +219,23 @@ func rowsToHits(res *lbug.QueryResult) ([]Hit, error) {
 
 // JSON output types
 type jsonOut struct {
-	Query      string    `json:"query"`
-	RootFilter string    `json:"root_filter"`
-	Count      int       `json:"count"`
-	Results    []jsonHit `json:"results"`
+	Query      string             `json:"query"`
+	RootFilter string             `json:"root_filter"`
+	Count      int                `json:"count"`
+	Results    []jsonHit          `json:"results"`
+	Web        *rank.SecondSource `json:"web,omitempty"`
 }
 
 type jsonHit struct {
-	ID      string  `json:"id"`
-	Text    string  `json:"text"`
-	Root    string  `json:"root"`
-	Score   float64 `json:"score"`
-	Snippet string  `json:"snippet,omitempty"`
+	ID      string         `json:"id"`
+	Text    string         `json:"text"`
+	Root    string         `json:"root"`
+	Score   float64        `json:"score"`
+	Snippet string         `json:"snippet,omitempty"`
+	Hops    []rank.HopNode `json:"hops,omitempty"`
 }
 
-func toJSONOut(hits []Hit, query, rootFilter string) *jsonOut {
+func toJSONOut(hits []Hit, query, rootFilter string, web *rank.SecondSource) *jsonOut {
 	out := make([]jsonHit, len(hits))
 	for i, h := range hits {
 		out[i] = jsonHit{
@@ -187,6 +244,7 @@ func toJSONOut(hits []Hit, query, rootFilter string) *jsonOut {
 			Root:    h.Root,
 			Score:   h.Score,
 			Snippet: h.Snippet,
+			Hops:    h.Hops,
 		}
 	}
 	return &jsonOut{
@@ -194,6 +252,7 @@ func toJSONOut(hits []Hit, query, rootFilter string) *jsonOut {
 		RootFilter: rootFilter,
 		Count:      len(hits),
 		Results:    out,
+		Web:        web,
 	}
 }
 
@@ -209,6 +268,18 @@ func resultsToDicts(hits []Hit) []any {
 		if h.Snippet != "" {
 			d = append(d, KV{"snippet", h.Snippet})
 		}
+		if len(h.Hops) > 0 {
+			nodes := make([]any, len(h.Hops))
+			for j, n := range h.Hops {
+				nodes[j] = Dict{
+					{"id", n.ID},
+					{"label", n.Label},
+					{"name", n.Name},
+					{"depth", n.Depth},
+				}
+			}
+			d = append(d, KV{"hops", nodes})
+		}
 		out[i] = d
 	}
 	return out

internal/brain/web.go

@@ -0,0 +1,56 @@
+package brain
+
+import (
+	"context"
+
+	"github.com/eSlider/2dph/internal/brain/rank"
+	"github.com/eSlider/2dph/internal/websearch"
+)
+
+func lookupWeb(ctx context.Context, query string) rank.SecondSource {
+	o := websearch.Lookup(ctx, query, websearch.LookupOpt{Limit: 5})
+	return toSecond(o)
+}
+
+func toSecond(o websearch.Output) rank.SecondSource {
+	hits := make([]rank.SecondSourceHit, 0, len(o.Results))
+	for _, h := range o.Results {
+		hits = append(hits, rank.SecondSourceHit{
+			Rank:    h.Rank,
+			Title:   h.Title,
+			URL:     h.URL,
+			Snippet: h.Snippet,
+			Engine:  h.Engine,
+		})
+	}
+	return rank.SecondSource{
+		Status:  o.Status,
+		Note:    o.Note,
+		Cached:  o.Cached,
+		Results: hits,
+	}
+}
+
+func secondToDict(w rank.SecondSource) Dict {
+	d := Dict{
+		{"status", w.Status},
+	}
+	if w.Note != "" {
+		d = append(d, KV{"note", w.Note})
+	}
+	if w.Cached {
+		d = append(d, KV{"cached", true})
+	}
+	rows := make([]any, 0, len(w.Results))
+	for _, h := range w.Results {
+		rows = append(rows, Dict{
+			{"rank", h.Rank},
+			{"title", h.Title},
+			{"url", h.URL},
+			{"snippet", h.Snippet},
+			{"engine", h.Engine},
+		})
+	}
+	d = append(d, KV{"results", rows})
+	return d
+}

internal/duckstats/duckstats.go

@@ -0,0 +1,47 @@
+// Package duckstats runs in-process DuckDB for columnar aggregates.
+// Graph facts stay in Ladybug. Web-search KV cache stays modernc sqlite.
+package duckstats
+
+import (
+	"database/sql"
+	"fmt"
+
+	_ "github.com/duckdb/duckdb-go/v2"
+)
+
+type Stats struct {
+	N   int     `json:"n"`
+	Min float64 `json:"min"`
+	P50 float64 `json:"p50"`
+	P95 float64 `json:"p95"`
+	Max float64 `json:"max"`
+	Avg float64 `json:"avg"`
+}
+
+func Quantiles(samples []float64) (Stats, error) {
+	if len(samples) == 0 {
+		return Stats{}, fmt.Errorf("duckstats: empty samples")
+	}
+	db, err := sql.Open("duckdb", "")
+	if err != nil {
+		return Stats{}, err
+	}
+	defer db.Close()
+	var s Stats
+	err = db.QueryRow(`
+SELECT count(v), min(v), quantile_cont(v, 0.5), quantile_cont(v, 0.95), max(v), avg(v)
+FROM (SELECT unnest(?) AS v)`, samples).Scan(
+		&s.N, &s.Min, &s.P50, &s.P95, &s.Max, &s.Avg)
+	return s, err
+}
+
+func CountJSONL(path string) (int64, error) {
+	db, err := sql.Open("duckdb", "")
+	if err != nil {
+		return 0, err
+	}
+	defer db.Close()
+	var n int64
+	err = db.QueryRow(`SELECT count(*) FROM read_json_auto(?)`, path).Scan(&n)
+	return n, err
+}

internal/duckstats/duckstats_test.go

@@ -0,0 +1,51 @@
+package duckstats
+
+import (
+	"os"
+	"testing"
+)
+
+func TestQuantilesEmpty(t *testing.T) {
+	_, err := Quantiles(nil)
+	if err == nil {
+		t.Fatal("empty slice must error")
+	}
+}
+
+func TestQuantilesOdd(t *testing.T) {
+	s, err := Quantiles([]float64{1, 2, 3, 4, 5})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if s.N != 5 {
+		t.Fatalf("n=%d", s.N)
+	}
+	if s.Min != 1 || s.Max != 5 {
+		t.Fatalf("min=%v max=%v", s.Min, s.Max)
+	}
+	if s.P50 != 3 {
+		t.Fatalf("p50=%v want 3", s.P50)
+	}
+	if s.Avg != 3 {
+		t.Fatalf("avg=%v want 3", s.Avg)
+	}
+	if s.P95 < 4.5 || s.P95 > 5 {
+		t.Fatalf("p95=%v want in [4.5,5]", s.P95)
+	}
+}
+
+func TestCountJSONL(t *testing.T) {
+	dir := t.TempDir()
+	p := dir + "/rows.jsonl"
+	body := "{\"ms\":1}\n{\"ms\":2}\n{\"ms\":3}\n"
+	if err := os.WriteFile(p, []byte(body), 0o600); err != nil {
+		t.Fatal(err)
+	}
+	n, err := CountJSONL(p)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if n != 3 {
+		t.Fatalf("count=%d want 3", n)
+	}
+}

internal/gitlog/gitlog.go

@@ -0,0 +1,180 @@
+// Package gitlog reads commit history with go-git (no git binary).
+package gitlog
+
+import (
+	"errors"
+	"fmt"
+	"path"
+	"path/filepath"
+	"sort"
+	"strings"
+	"time"
+
+	"github.com/go-git/go-git/v5"
+	"github.com/go-git/go-git/v5/plumbing/object"
+)
+
+type Options struct {
+	Limit int
+	Since time.Time
+}
+
+type Commit struct {
+	SHA     string   `json:"sha"`
+	Author  string   `json:"author"`
+	Email   string   `json:"email"`
+	Date    string   `json:"date"`
+	Subject string   `json:"subject"`
+	Files   []string `json:"files"`
+}
+
+type Leaf struct {
+	Source  string `json:"source"`
+	Repo    string `json:"repo"`
+	Heading string `json:"heading"`
+	Text    string `json:"text"`
+	Type    string `json:"type"`
+	Status  string `json:"status"`
+	Related string `json:"related"`
+}
+
+// Log walks commits from HEAD, newest first, skipping merges.
+func Log(repo string, opt Options) ([]Commit, error) {
+	r, err := git.PlainOpen(repo)
+	if err != nil {
+		return nil, err
+	}
+	logOpt := &git.LogOptions{Order: git.LogOrderCommitterTime}
+	if !opt.Since.IsZero() {
+		t := opt.Since
+		logOpt.Since = &t
+	}
+	iter, err := r.Log(logOpt)
+	if err != nil {
+		return nil, err
+	}
+	defer iter.Close()
+
+	var out []Commit
+	err = iter.ForEach(func(c *object.Commit) error {
+		if c.NumParents() > 1 {
+			return nil
+		}
+		if opt.Limit > 0 && len(out) >= opt.Limit {
+			return Stop
+		}
+		files, ferr := changedFiles(c)
+		if ferr != nil {
+			return ferr
+		}
+		out = append(out, Commit{
+			SHA:     c.Hash.String(),
+			Author:  c.Author.Name,
+			Email:   c.Author.Email,
+			Date:    c.Author.When.Format(time.RFC3339),
+			Subject: firstLine(c.Message),
+			Files:   files,
+		})
+		return nil
+	})
+	if errors.Is(err, Stop) {
+		err = nil
+	}
+	return out, err
+}
+
+// Stop ends a log walk early (limit reached).
+var Stop = fmt.Errorf("gitlog: stop")
+
+func changedFiles(c *object.Commit) ([]string, error) {
+	var names []string
+	if c.NumParents() == 0 {
+		t, err := c.Tree()
+		if err != nil {
+			return nil, err
+		}
+		err = t.Files().ForEach(func(f *object.File) error {
+			names = append(names, f.Name)
+			return nil
+		})
+		sort.Strings(names)
+		return names, err
+	}
+	parent, err := c.Parent(0)
+	if err != nil {
+		return nil, err
+	}
+	from, err := parent.Tree()
+	if err != nil {
+		return nil, err
+	}
+	to, err := c.Tree()
+	if err != nil {
+		return nil, err
+	}
+	changes, err := object.DiffTree(from, to)
+	if err != nil {
+		return nil, err
+	}
+	for _, ch := range changes {
+		name := ch.To.Name
+		if name == "" {
+			name = ch.From.Name
+		}
+		if name != "" {
+			names = append(names, name)
+		}
+	}
+	sort.Strings(names)
+	return names, nil
+}
+
+func firstLine(msg string) string {
+	msg = strings.ReplaceAll(msg, "\r\n", "\n")
+	if i := strings.IndexByte(msg, '\n'); i >= 0 {
+		return strings.TrimSpace(msg[:i])
+	}
+	return strings.TrimSpace(msg)
+}
+
+func ToLeaf(c Commit, repo string) Leaf {
+	short := c.SHA
+	if len(short) > 12 {
+		short = short[:12]
+	}
+	head := fmt.Sprintf("commit %s — %s", short, c.Subject)
+	body := []string{
+		fmt.Sprintf("commit %s in %s — %s", short, repo, c.Subject),
+		fmt.Sprintf("Author: %s <%s>", c.Author, c.Email),
+		fmt.Sprintf("Date: %s", c.Date),
+	}
+	if len(c.Files) > 0 {
+		body = append(body, "Changing: "+strings.Join(c.Files, ", "))
+	}
+	return Leaf{
+		Source:  repo + "@" + c.SHA,
+		Repo:    repo,
+		Heading: head,
+		Text:    strings.Join(body, "\n"),
+		Type:    "commit",
+		Status:  "current",
+		Related: strings.Join(c.Files, ","),
+	}
+}
+
+func RepoName(repo string) (string, error) {
+	r, err := git.PlainOpen(repo)
+	if err != nil {
+		return filepath.Base(repo), err
+	}
+	rem, err := r.Remote("origin")
+	if err != nil {
+		return filepath.Base(repo), nil
+	}
+	urls := rem.Config().URLs
+	if len(urls) == 0 {
+		return filepath.Base(repo), nil
+	}
+	u := strings.TrimSuffix(strings.TrimSuffix(urls[0], "/"), ".git")
+	return path.Base(strings.ReplaceAll(u, "\\", "/")), nil
+}

internal/gitlog/gitlog_test.go

@@ -0,0 +1,243 @@
+package gitlog
+
+import (
+	"os"
+	"path/filepath"
+	"sort"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/go-git/go-git/v5"
+	"github.com/go-git/go-git/v5/config"
+	"github.com/go-git/go-git/v5/plumbing"
+	"github.com/go-git/go-git/v5/plumbing/object"
+)
+
+func TestLogReadsCommitsWithoutGitBinary(t *testing.T) {
+	dir := initRepo(t, []commitSpec{
+		{
+			when:    time.Date(2026, 8, 10, 12, 0, 0, 0, time.FixedZone("CEST", 3600)),
+			name:    "Ada Lovelace",
+			email:   "ada@example.com",
+			subject: "feat: first commit",
+			files:   map[string]string{"README.md": "hi\n", "src/main.c": "int main(){}\n"},
+		},
+		{
+			when:    time.Date(2026, 8, 11, 9, 30, 0, 0, time.FixedZone("CEST", 3600)),
+			name:    "Bob Babbage",
+			email:   "bob@example.com",
+			subject: "fix: typo",
+			files:   map[string]string{"docs/notes.md": "note\n"},
+		},
+	})
+
+	cs, err := Log(dir, Options{})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(cs) != 2 {
+		t.Fatalf("commits = %d, want 2", len(cs))
+	}
+	if cs[0].Subject != "fix: typo" {
+		t.Fatalf("head subject = %q, want fix: typo", cs[0].Subject)
+	}
+	if cs[1].Author != "Ada Lovelace" || cs[1].Email != "ada@example.com" {
+		t.Fatalf("author = %s <%s>", cs[1].Author, cs[1].Email)
+	}
+	sort.Strings(cs[1].Files)
+	if got := cs[1].Files; len(got) != 2 || got[0] != "README.md" || got[1] != "src/main.c" {
+		t.Fatalf("first commit files = %v", got)
+	}
+	if cs[0].Files[0] != "docs/notes.md" {
+		t.Fatalf("second commit files = %v", cs[0].Files)
+	}
+}
+
+func TestLogSkipsMerges(t *testing.T) {
+	dir := initRepo(t, []commitSpec{{
+		when: time.Now(), name: "Ada Lovelace", email: "ada@example.com",
+		subject: "base", files: map[string]string{"a.txt": "a\n"},
+	}})
+	r, err := git.PlainOpen(dir)
+	if err != nil {
+		t.Fatal(err)
+	}
+	head, err := r.Head()
+	if err != nil {
+		t.Fatal(err)
+	}
+	c, err := r.CommitObject(head.Hash())
+	if err != nil {
+		t.Fatal(err)
+	}
+	// Second parent: duplicate the same tree so we do not need a real branch.
+	merge := &object.Commit{
+		Author:       object.Signature{Name: "Ada Lovelace", Email: "ada@example.com", When: time.Now()},
+		Committer:    object.Signature{Name: "Ada Lovelace", Email: "ada@example.com", When: time.Now()},
+		Message:      "merge",
+		TreeHash:     c.TreeHash,
+		ParentHashes: []plumbing.Hash{c.Hash, c.Hash},
+	}
+	obj := r.Storer.NewEncodedObject()
+	if err := merge.Encode(obj); err != nil {
+		t.Fatal(err)
+	}
+	h, err := r.Storer.SetEncodedObject(obj)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := r.Storer.SetReference(plumbing.NewHashReference(head.Name(), h)); err != nil {
+		t.Fatal(err)
+	}
+
+	cs, err := Log(dir, Options{})
+	if err != nil {
+		t.Fatal(err)
+	}
+	for _, x := range cs {
+		if x.Subject == "merge" {
+			t.Fatal("merge commit was not skipped")
+		}
+	}
+	if len(cs) != 1 || cs[0].Subject != "base" {
+		t.Fatalf("after skip merges: %+v", subjects(cs))
+	}
+}
+
+func TestLogSinceAndLimit(t *testing.T) {
+	old := time.Date(2025, 1, 1, 0, 0, 0, 0, time.UTC)
+	neu := time.Date(2026, 6, 1, 0, 0, 0, 0, time.UTC)
+	dir := initRepo(t, []commitSpec{
+		{when: old, name: "Ada Lovelace", email: "ada@example.com", subject: "old", files: map[string]string{"old.md": "x"}},
+		{when: neu, name: "Ada Lovelace", email: "ada@example.com", subject: "new", files: map[string]string{"new.md": "y"}},
+	})
+	cs, err := Log(dir, Options{Since: neu.Add(-time.Hour)})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(cs) != 1 || cs[0].Subject != "new" {
+		t.Fatalf("since filter: %v", subjects(cs))
+	}
+	cs, err = Log(dir, Options{Limit: 1})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(cs) != 1 {
+		t.Fatalf("limit=1 got %d", len(cs))
+	}
+}
+
+func TestLeafShape(t *testing.T) {
+	c := Commit{
+		SHA:     "a1b2c3d4e5f6aaaa",
+		Author:  "Ada Lovelace",
+		Email:   "ada@example.com",
+		Date:    "2026-08-10T12:00:00+01:00",
+		Subject: "feat: first commit",
+		Files:   []string{"README.md", "src/main.c"},
+	}
+	lf := ToLeaf(c, "sample-repo")
+	if lf.Type != "commit" || lf.Repo != "sample-repo" {
+		t.Fatalf("leaf meta = %+v", lf)
+	}
+	if lf.Source != "sample-repo@a1b2c3d4e5f6aaaa" {
+		t.Fatalf("source = %s", lf.Source)
+	}
+	if lf.Related != "README.md,src/main.c" {
+		t.Fatalf("related = %s", lf.Related)
+	}
+	if lf.Heading != "commit a1b2c3d4e5f6 — feat: first commit" {
+		t.Fatalf("heading = %q", lf.Heading)
+	}
+	if !strings.Contains(lf.Text, "Ada Lovelace") || !strings.Contains(lf.Text, "README.md") {
+		t.Fatalf("text = %s", lf.Text)
+	}
+}
+
+func TestRepoNameFromOrigin(t *testing.T) {
+	dir := initRepo(t, []commitSpec{{
+		when: time.Now(), name: "Ada Lovelace", email: "ada@example.com",
+		subject: "init", files: map[string]string{"README.md": "x"},
+	}})
+	r, err := git.PlainOpen(dir)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if _, err := r.CreateRemote(&config.RemoteConfig{
+		Name: "origin",
+		URLs: []string{"https://git.example.com/eSlider/sample-repo.git"},
+	}); err != nil {
+		t.Fatal(err)
+	}
+	name, err := RepoName(dir)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if name != "sample-repo" {
+		t.Fatalf("RepoName = %q, want sample-repo", name)
+	}
+}
+
+func TestRepoNameFallsBackToDir(t *testing.T) {
+	dir := initRepo(t, []commitSpec{{
+		when: time.Now(), name: "Ada Lovelace", email: "ada@example.com",
+		subject: "init", files: map[string]string{"README.md": "x"},
+	}})
+	name, err := RepoName(dir)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if name != filepath.Base(dir) {
+		t.Fatalf("RepoName = %q, want %s", name, filepath.Base(dir))
+	}
+}
+
+type commitSpec struct {
+	when    time.Time
+	name    string
+	email   string
+	subject string
+	files   map[string]string
+}
+
+func initRepo(t *testing.T, specs []commitSpec) string {
+	t.Helper()
+	dir := t.TempDir()
+	r, err := git.PlainInit(dir, false)
+	if err != nil {
+		t.Fatal(err)
+	}
+	w, err := r.Worktree()
+	if err != nil {
+		t.Fatal(err)
+	}
+	for _, s := range specs {
+		for path, body := range s.files {
+			full := filepath.Join(dir, path)
+			if err := os.MkdirAll(filepath.Dir(full), 0o755); err != nil && !os.IsExist(err) {
+				t.Fatal(err)
+			}
+			if err := os.WriteFile(full, []byte(body), 0o644); err != nil {
+				t.Fatal(err)
+			}
+			if _, err := w.Add(path); err != nil {
+				t.Fatal(err)
+			}
+		}
+		if _, err := w.Commit(s.subject, &git.CommitOptions{
+			Author: &object.Signature{Name: s.name, Email: s.email, When: s.when},
+		}); err != nil {
+			t.Fatal(err)
+		}
+	}
+	return dir
+}
+
+func subjects(cs []Commit) []string {
+	out := make([]string, len(cs))
+	for i, c := range cs {
+		out[i] = c.Subject
+	}
+	return out
+}

internal/httpapi/mcp.go

@@ -0,0 +1,193 @@
+package httpapi
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"strconv"
+	"strings"
+)
+
+type rpcReq struct {
+	JSONRPC string          `json:"jsonrpc"`
+	ID      json.RawMessage `json:"id"`
+	Method  string          `json:"method"`
+	Params  json.RawMessage `json:"params"`
+}
+
+type rpcErr struct {
+	Code    int    `json:"code"`
+	Message string `json:"message"`
+}
+
+func (s *Server) handleOpenAPI(w http.ResponseWriter, _ *http.Request) {
+	writeJSON(w, http.StatusOK, OpenAPI())
+}
+
+func (s *Server) handleMCP(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodPost {
+		writeJSON(w, http.StatusMethodNotAllowed, map[string]any{"error": "POST JSON-RPC"})
+		return
+	}
+	raw, err := io.ReadAll(io.LimitReader(r.Body, 1<<20))
+	if err != nil {
+		writeJSON(w, http.StatusBadRequest, map[string]any{"error": "read body"})
+		return
+	}
+	var req rpcReq
+	if err := json.Unmarshal(raw, &req); err != nil {
+		writeJSON(w, http.StatusOK, rpcResult(nil, nil, &rpcErr{-32700, "parse error"}))
+		return
+	}
+	result, rpcErrv, callErr := s.mcpDispatch(r, req)
+	if callErr != nil {
+		writeJSON(w, http.StatusOK, rpcResult(req.ID, nil, &rpcErr{-32603, callErr.Error()}))
+		return
+	}
+	writeJSON(w, http.StatusOK, rpcResult(req.ID, result, rpcErrv))
+}
+
+func (s *Server) mcpDispatch(r *http.Request, req rpcReq) (any, *rpcErr, error) {
+	switch req.Method {
+	case "initialize":
+		return map[string]any{
+			"protocolVersion": "2024-11-05",
+			"capabilities":    map[string]any{"tools": map[string]any{}},
+			"serverInfo":      map[string]any{"name": "2dph", "version": "1"},
+		}, nil, nil
+	case "notifications/initialized", "notifications/cancelled":
+		return map[string]any{}, nil, nil
+	case "tools/list":
+		return map[string]any{"tools": MCPTools()}, nil, nil
+	case "tools/call":
+		out, err := s.mcpCall(r, req.Params)
+		return out, nil, err
+	case "ping":
+		return map[string]any{}, nil, nil
+	default:
+		return nil, &rpcErr{-32601, "method not found"}, nil
+	}
+}
+
+func (s *Server) mcpCall(r *http.Request, params json.RawMessage) (any, error) {
+	var p struct {
+		Name      string         `json:"name"`
+		Arguments map[string]any `json:"arguments"`
+	}
+	if err := json.Unmarshal(params, &p); err != nil {
+		return nil, fmt.Errorf("params")
+	}
+	if p.Arguments == nil {
+		p.Arguments = map[string]any{}
+	}
+	var (
+		body []byte
+		err  error
+	)
+	switch p.Name {
+	case "search":
+		q := strings.TrimSpace(fmt.Sprint(p.Arguments["q"]))
+		if q == "" || q == "<nil>" {
+			return mcpText(`{"error":"q required"}`, true), nil
+		}
+		limit := 10
+		if raw, ok := p.Arguments["n"]; ok {
+			switch n := raw.(type) {
+			case float64:
+				limit = int(n)
+			case string:
+				if v, e := strconv.Atoi(n); e == nil {
+					limit = v
+				}
+			}
+		}
+		if limit < 1 || limit > 100 {
+			return mcpText(`{"error":"n must be int 1..100"}`, true), nil
+		}
+		if !s.tryAcquire(r) {
+			return nil, fmt.Errorf("cancelled")
+		}
+		defer s.release()
+		body, err = s.api.Search(r.Context(), q, limit)
+	case "get":
+		id := strings.TrimSpace(fmt.Sprint(p.Arguments["id"]))
+		if id == "" || id == "<nil>" {
+			return mcpText(`{"error":"id required"}`, true), nil
+		}
+		full := false
+		switch v := p.Arguments["body"].(type) {
+		case bool:
+			full = v
+		case string:
+			full = v == "1" || v == "true"
+		}
+		if !s.tryAcquire(r) {
+			return nil, fmt.Errorf("cancelled")
+		}
+		defer s.release()
+		body, err = s.api.Get(r.Context(), id, full)
+	case "stats":
+		if !s.tryAcquire(r) {
+			return nil, fmt.Errorf("cancelled")
+		}
+		defer s.release()
+		body, err = s.api.Stats(r.Context())
+	case "audit":
+		if !s.tryAcquire(r) {
+			return nil, fmt.Errorf("cancelled")
+		}
+		defer s.release()
+		body, err = s.api.Audit(r.Context())
+	case "ingest":
+		if !s.tryAcquire(r) {
+			return nil, fmt.Errorf("cancelled")
+		}
+		defer s.release()
+		var payload []byte
+		text := strings.TrimSpace(fmt.Sprint(p.Arguments["text"]))
+		if text != "" && text != "<nil>" {
+			payload, err = json.Marshal(p.Arguments)
+			if err != nil {
+				return nil, err
+			}
+		}
+		body, err = s.api.Ingest(r.Context(), payload)
+	default:
+		return nil, fmt.Errorf("unknown tool %s", p.Name)
+	}
+	if err != nil {
+		return mcpText(err.Error(), true), nil
+	}
+	return mcpText(string(body), false), nil
+}
+
+func mcpText(text string, isError bool) map[string]any {
+	return map[string]any{
+		"content": []any{map[string]any{"type": "text", "text": text}},
+		"isError": isError,
+	}
+}
+
+type rpcResp struct {
+	JSONRPC string          `json:"jsonrpc"`
+	ID      json.RawMessage `json:"id"`
+	Result  any             `json:"result,omitempty"`
+	Error   *rpcErr         `json:"error,omitempty"`
+}
+
+func rpcResult(id json.RawMessage, result any, err *rpcErr) rpcResp {
+	out := rpcResp{JSONRPC: "2.0", ID: id}
+	if len(id) == 0 {
+		out.ID = []byte("null")
+	}
+	if err != nil {
+		out.Error = err
+		return out
+	}
+	if result == nil {
+		result = map[string]any{}
+	}
+	out.Result = result
+	return out
+}

internal/httpapi/server.go

@@ -1,16 +1,17 @@
-// Package server serves the 2dph brain over HTTP.
+// Package httpapi serves the 2dph brain over HTTP.
 //
 // Async by design: every request runs on its own goroutine, and CPU-heavy
-// searches are serialized through a bounded worker pool (a counting
-// semaphore) so N requests can't spawn N search processes at once.
+// searches are serialized through a bounded worker pool so N requests can't
+// spawn N backends at once.
 //
-// Used by bin/brain/serve.go.
+// Used by bin/brain/serve.go. Tests inject a fake API (no exec, no ladybug).
 package httpapi
 
 import (
 	"context"
 	"encoding/json"
 	"errors"
+	"io"
 	"log"
 	"net/http"
 	"os"
@@ -21,30 +22,49 @@ import (
 	"time"
 )
 
-type Searcher interface {
+// API is the in-process brain surface. Production serve.go wires internal/brain.
+type API interface {
 	Search(ctx context.Context, query string, limit int) ([]byte, error)
+	Get(ctx context.Context, id string, body bool) ([]byte, error)
+	Stats(ctx context.Context) ([]byte, error)
+	Audit(ctx context.Context) ([]byte, error)
+	Ingest(ctx context.Context, body []byte) ([]byte, error)
 }
 
 type Server struct {
-	searcher  Searcher
+	api       API
 	semaphore chan struct{}
 }
 
 const defaultPort = 8630
 
-func NewServer(searcher Searcher, workers int) http.Handler {
+var errUnimplemented = errors.New("not implemented")
+
+func NewServer(api API, workers int) http.Handler {
 	return &Server{
-		searcher:  searcher,
+		api:       api,
 		semaphore: make(chan struct{}, workers),
 	}
 }
 
 func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
-	switch {
-	case r.URL.Path == "/health":
+	switch r.URL.Path {
+	case PathHealth:
 		writeJSON(w, http.StatusOK, map[string]any{"status": "ok"})
-	case r.URL.Path == "/search":
+	case PathSearch:
 		s.handleSearch(w, r)
+	case PathGet:
+		s.handleGet(w, r)
+	case PathStats:
+		s.handleJSON(w, r, s.api.Stats)
+	case PathAudit:
+		s.handleJSON(w, r, s.api.Audit)
+	case PathIngest:
+		s.handleIngest(w, r)
+	case PathOpenAPI:
+		s.handleOpenAPI(w, r)
+	case PathMCP:
+		s.handleMCP(w, r)
 	default:
 		writeJSON(w, http.StatusNotFound, map[string]any{"error": "not found"})
 	}
@@ -65,19 +85,84 @@ func (s *Server) handleSearch(w http.ResponseWriter, r *http.Request) {
 		}
 		limit = n
 	}
-
-	// Worker pool: block until a slot frees, so burst concurrency still
-	// bounds memory (no unbounded python processes).
-	select {
-	case s.semaphore <- struct{}{}:
-		defer func() { <-s.semaphore }()
-	case <-r.Context().Done():
+	if !s.acquire(w, r) {
 		return
 	}
+	defer s.release()
+	body, err := s.api.Search(r.Context(), q, limit)
+	writeAPI(w, body, err)
+}
 
-	body, err := s.searcher.Search(r.Context(), q, limit)
+func (s *Server) handleGet(w http.ResponseWriter, r *http.Request) {
+	id := strings.TrimSpace(r.URL.Query().Get("id"))
+	if id == "" {
+		writeJSON(w, http.StatusBadRequest, map[string]any{"error": "id required"})
+		return
+	}
+	body := r.URL.Query().Get("body") == "1" || r.URL.Query().Get("body") == "true"
+	if !s.acquire(w, r) {
+		return
+	}
+	defer s.release()
+	out, err := s.api.Get(r.Context(), id, body)
+	writeAPI(w, out, err)
+}
+
+func (s *Server) handleJSON(w http.ResponseWriter, r *http.Request, fn func(context.Context) ([]byte, error)) {
+	if !s.acquire(w, r) {
+		return
+	}
+	defer s.release()
+	body, err := fn(r.Context())
+	writeAPI(w, body, err)
+}
+
+func (s *Server) handleIngest(w http.ResponseWriter, r *http.Request) {
+	var raw []byte
+	if r.Method == http.MethodPost {
+		b, err := io.ReadAll(io.LimitReader(r.Body, 1<<20))
+		if err != nil {
+			writeJSON(w, http.StatusBadRequest, map[string]any{"error": "read body"})
+			return
+		}
+		raw = b
+	}
+	if !s.acquire(w, r) {
+		return
+	}
+	defer s.release()
+	body, err := s.api.Ingest(r.Context(), raw)
+	writeAPI(w, body, err)
+}
+
+func (s *Server) tryAcquire(r *http.Request) bool {
+	return s.acquire(nopWriter{}, r)
+}
+
+type nopWriter struct{}
+
+func (nopWriter) Header() http.Header       { return http.Header{} }
+func (nopWriter) Write([]byte) (int, error) { return 0, nil }
+func (nopWriter) WriteHeader(int)           {}
+
+func (s *Server) acquire(w http.ResponseWriter, r *http.Request) bool {
+	select {
+	case s.semaphore <- struct{}{}:
+		return true
+	case <-r.Context().Done():
+		return false
+	}
+}
+
+func (s *Server) release() { <-s.semaphore }
+
+func writeAPI(w http.ResponseWriter, body []byte, err error) {
 	if err != nil {
-		writeJSON(w, http.StatusGatewayTimeout, map[string]any{"error": err.Error()})
+		code := http.StatusBadGateway
+		if errors.Is(err, errUnimplemented) {
+			code = http.StatusNotImplemented
+		}
+		writeJSON(w, code, map[string]any{"error": err.Error()})
 		return
 	}
 	writeRaw(w, http.StatusOK, body)
@@ -95,17 +180,20 @@ func writeRaw(w http.ResponseWriter, code int, body []byte) {
 	w.Write(body)
 }
 
-// brainSearcher shells out to the Go brain-search binary (not Python).
-// A single search is bounded and short-lived; the worker pool keeps at most N live.
-type brainSearcher struct {
-	cmdPath string
-	timeout time.Duration
+// ExecSearcher shells out to var/bin/brain-search. Fallback when the serve
+// binary is built without ladybug cgo (CI / tags=brain_serve only).
+type ExecSearcher struct {
+	CmdPath string
+	Timeout time.Duration
 }
 
-func (b *brainSearcher) Search(ctx context.Context, query string, limit int) ([]byte, error) {
-	ctx, cancel := context.WithTimeout(ctx, b.timeout)
+func (b ExecSearcher) Search(ctx context.Context, query string, limit int) ([]byte, error) {
+	if b.Timeout == 0 {
+		b.Timeout = 60 * time.Second
+	}
+	ctx, cancel := context.WithTimeout(ctx, b.Timeout)
 	defer cancel()
-	cmd := exec.CommandContext(ctx, b.cmdPath, "--json", "-n", strconv.Itoa(limit), query)
+	cmd := exec.CommandContext(ctx, b.CmdPath, "--json", "-n", strconv.Itoa(limit), query)
 	out, err := cmd.Output()
 	if err != nil {
 		var exitErr *exec.ExitError
@@ -117,6 +205,37 @@ func (b *brainSearcher) Search(ctx context.Context, query string, limit int) ([]
 	return out, nil
 }
 
+func (ExecSearcher) Get(context.Context, string, bool) ([]byte, error) {
+	return nil, errUnimplemented
+}
+func (ExecSearcher) Stats(context.Context) ([]byte, error) { return nil, errUnimplemented }
+func (ExecSearcher) Audit(context.Context) ([]byte, error) { return nil, errUnimplemented }
+func (b ExecSearcher) Ingest(ctx context.Context, body []byte) ([]byte, error) {
+	if len(strings.TrimSpace(string(body))) == 0 {
+		return json.Marshal(map[string]any{
+			"mode":    "add",
+			"command": "bin/brain/add.go",
+			"rebuild": "bin/brain/index.go --rebuild",
+		})
+	}
+	root := os.Getenv("KB_ROOT")
+	if root == "" {
+		root = "."
+	}
+	cmd := exec.CommandContext(ctx, filepath.Join(root, "bin/kb/add"), "--json")
+	cmd.Stdin = strings.NewReader(string(body))
+	cmd.Dir = root
+	out, err := cmd.Output()
+	if err != nil {
+		var exitErr *exec.ExitError
+		if errors.As(err, &exitErr) {
+			return nil, errors.New("add failed: " + strings.TrimSpace(string(exitErr.Stderr)))
+		}
+		return nil, err
+	}
+	return out, nil
+}
+
 func defaultSearchCmd(root string) string {
 	if env := os.Getenv("KB_SEARCH_CMD"); env != "" {
 		return env
@@ -124,11 +243,7 @@ func defaultSearchCmd(root string) string {
 	return filepath.Join(root, "var", "bin", "brain-search")
 }
 
-// Run starts the HTTP server. Reads env: KB_SEARCH_CMD (default
-// $KB_ROOT/var/bin/brain-search), KB_WORKERS (default 4), KB_PORT (default 8630).
-func Run() {
-	root := os.Getenv("KB_ROOT")
-	searchPath := defaultSearchCmd(root)
+func workersAndPort() (int, int) {
 	workers := 4
 	if raw := os.Getenv("KB_WORKERS"); raw != "" {
 		if n, err := strconv.Atoi(raw); err == nil && n > 0 {
@@ -141,11 +256,19 @@ func Run() {
 			port = n
 		}
 	}
+	return workers, port
+}
 
-	searcher := &brainSearcher{cmdPath: searchPath, timeout: 60 * time.Second}
-	handler := NewServer(searcher, workers)
+// Run starts the HTTP server with an injected API (in-process brain, or ExecSearcher).
+func Run(api API) {
+	if api == nil {
+		root := os.Getenv("KB_ROOT")
+		api = ExecSearcher{CmdPath: defaultSearchCmd(root), Timeout: 60 * time.Second}
+	}
+	workers, port := workersAndPort()
+	handler := NewServer(api, workers)
 	addr := "127.0.0.1:" + strconv.Itoa(port)
-	log.Printf("serve: %s (workers=%d cmd=%s)", addr, workers, searchPath)
+	log.Printf("serve: %s (workers=%d)", addr, workers)
 	if err := http.ListenAndServe(addr, handler); err != nil {
 		log.Fatal(err)
 	}

internal/httpapi/server_test.go

@@ -1,10 +1,12 @@
 package httpapi
 
 import (
+	"bytes"
 	"context"
 	"encoding/json"
 	"net/http"
 	"net/http/httptest"
+	"os"
 	"strings"
 	"sync"
 	"sync/atomic"
@@ -47,6 +49,29 @@ func (f *fakeSearcher) Search(ctx context.Context, query string, limit int) ([]b
 	return []byte(`{"query":"` + query + `","count":0,"results":[]}`), nil
 }
 
+func (f *fakeSearcher) Get(_ context.Context, id string, body bool) ([]byte, error) {
+	out := map[string]any{"id": id, "root": "info"}
+	if body {
+		out["text"] = "fake body"
+	}
+	return json.Marshal(out)
+}
+
+func (f *fakeSearcher) Stats(context.Context) ([]byte, error) {
+	return []byte(`{"total":0,"by_root":{}}`), nil
+}
+
+func (f *fakeSearcher) Audit(context.Context) ([]byte, error) {
+	return []byte(`{"status":"ok"}`), nil
+}
+
+func (f *fakeSearcher) Ingest(_ context.Context, body []byte) ([]byte, error) {
+	if len(bytes.TrimSpace(body)) == 0 {
+		return []byte(`{"mode":"add","command":"bin/brain/add.go"}`), nil
+	}
+	return []byte(`{"mode":"add","ids":["fake-leaf"]}`), nil
+}
+
 func (f *fakeSearcher) count() int {
 	f.mu.Lock()
 	defer f.mu.Unlock()
@@ -142,6 +167,68 @@ func TestSearchRejectsBadLimit(t *testing.T) {
 	}
 }
 
+func TestGetLeaf(t *testing.T) {
+	fs := &fakeSearcher{callback: func(q string, limit int) ([]byte, error) {
+		return []byte(`{}`), nil
+	}}
+	h := NewServer(fs, 1)
+	if code, _ := get(t, h, "/get"); code != http.StatusBadRequest {
+		t.Fatalf("missing id code = %d, want 400", code)
+	}
+	code, body := get(t, h, "/get?id=leaf-1&body=1")
+	if code != http.StatusOK {
+		t.Fatalf("get code = %d, want 200 body=%s", code, body)
+	}
+	if !strings.Contains(string(body), "leaf-1") {
+		t.Fatalf("get body %s missing id", body)
+	}
+}
+
+func TestStatsAuditIngest(t *testing.T) {
+	h := NewServer(&fakeSearcher{}, 1)
+	for _, path := range []string{"/stats", "/audit", "/ingest"} {
+		code, body := get(t, h, path)
+		if code != http.StatusOK {
+			t.Fatalf("%s code = %d, want 200 (%s)", path, code, body)
+		}
+		if !json.Valid(body) {
+			t.Fatalf("%s body not json: %s", path, body)
+		}
+	}
+}
+
+func TestIngestIsAddNotRebuildHint(t *testing.T) {
+	h := NewServer(&fakeSearcher{}, 1)
+	code, body := get(t, h, "/ingest")
+	if code != http.StatusOK {
+		t.Fatalf("GET /ingest code = %d body=%s", code, body)
+	}
+	if strings.Contains(string(body), `"add":"v2"`) || strings.Contains(string(body), "write is v2") {
+		t.Fatalf("GET /ingest still a v2 hint: %s", body)
+	}
+	if !strings.Contains(string(body), "bin/brain/add.go") {
+		t.Fatalf("GET /ingest should name add.go: %s", body)
+	}
+	code, body = postJSON(t, h, "/ingest", `{"text":"hello","root":"info","source":"t"}`)
+	if code != http.StatusOK {
+		t.Fatalf("POST /ingest code = %d body=%s", code, body)
+	}
+	if !strings.Contains(string(body), "fake-leaf") {
+		t.Fatalf("POST /ingest should add: %s", body)
+	}
+}
+
+func TestHTTPPackageDoesNotExecPython(t *testing.T) {
+	raw, err := os.ReadFile("server.go")
+	if err != nil {
+		t.Fatal(err)
+	}
+	lower := strings.ToLower(string(raw))
+	if strings.Contains(lower, "python3") || strings.Contains(lower, "bin/kb/search") {
+		t.Fatal("httpapi must not exec Python or bin/kb/search")
+	}
+}
+
 func TestDefaultSearchCmdIsBrainNotPython(t *testing.T) {
 	t.Setenv("KB_SEARCH_CMD", "")
 	cmd := defaultSearchCmd("/repo")

internal/httpapi/spec.go

@@ -0,0 +1,152 @@
+package httpapi
+
+import "strings"
+
+// Shared HTTP surface: OpenAPI paths and MCP tools are generated from Ops.
+// ServeHTTP must keep the same path strings.
+
+type Param struct {
+	Name, In, Type, Description string
+	Required                    bool
+}
+
+type Op struct {
+	Path, Method, ID, Summary string
+	Params                    []Param
+	MCP                       bool
+}
+
+const (
+	PathHealth  = "/health"
+	PathSearch  = "/search"
+	PathGet     = "/get"
+	PathStats   = "/stats"
+	PathAudit   = "/audit"
+	PathIngest  = "/ingest"
+	PathOpenAPI = "/openapi.json"
+	PathMCP     = "/mcp"
+)
+
+var Ops = []Op{
+	{Path: PathHealth, Method: "get", ID: "health", Summary: "liveness"},
+	{
+		Path: PathSearch, Method: "get", ID: "search", Summary: "deduction search (facts → info → web)",
+		MCP: true,
+		Params: []Param{
+			{Name: "q", In: "query", Type: "string", Description: "search query", Required: true},
+			{Name: "n", In: "query", Type: "integer", Description: "hit limit 1..100 (default 10)"},
+		},
+	},
+	{
+		Path: PathGet, Method: "get", ID: "get", Summary: "read one leaf by id",
+		MCP: true,
+		Params: []Param{
+			{Name: "id", In: "query", Type: "string", Description: "leaf id", Required: true},
+			{Name: "body", In: "query", Type: "boolean", Description: "include full text"},
+		},
+	},
+	{Path: PathStats, Method: "get", ID: "stats", Summary: "index health", MCP: true},
+	{Path: PathAudit, Method: "get", ID: "audit", Summary: "facts confidence histogram", MCP: true},
+	{
+		Path: PathIngest, Method: "post", ID: "ingest", Summary: "add a leaf without rebuild",
+		MCP: true,
+		Params: []Param{
+			{Name: "text", In: "query", Type: "string", Description: "leaf text (omit for CLI hint)"},
+			{Name: "root", In: "query", Type: "string", Description: "facts or info (default info)"},
+			{Name: "source", In: "query", Type: "string", Description: "evidence pointer; facts need two sources"},
+		},
+	},
+	{Path: PathOpenAPI, Method: "get", ID: "openapi", Summary: "OpenAPI 3 document for this server"},
+}
+
+func OpenAPI() map[string]any {
+	paths := map[string]any{}
+	for _, op := range Ops {
+		params := make([]any, 0, len(op.Params))
+		for _, p := range op.Params {
+			params = append(params, map[string]any{
+				"name":        p.Name,
+				"in":          p.In,
+				"required":    p.Required,
+				"description": p.Description,
+				"schema":      map[string]any{"type": p.Type},
+			})
+		}
+		item := map[string]any{
+			"operationId": op.ID,
+			"summary":     op.Summary,
+			"responses": map[string]any{
+				"200": map[string]any{
+					"description": "JSON",
+					"content": map[string]any{
+						"application/json": map[string]any{
+							"schema": map[string]any{"type": "object"},
+						},
+					},
+				},
+			},
+		}
+		if len(params) > 0 {
+			item["parameters"] = params
+		}
+		paths[op.Path] = map[string]any{op.Method: item}
+	}
+	return map[string]any{
+		"openapi": "3.0.3",
+		"info": map[string]any{
+			"title":       "2dph brain",
+			"version":     "1",
+			"description": "Same handlers as bin/brain/serve.go. MCP tools at POST /mcp match these paths.",
+		},
+		"paths": paths,
+	}
+}
+
+type MCPTool struct {
+	Name        string         `json:"name"`
+	Description string         `json:"description"`
+	InputSchema map[string]any `json:"inputSchema"`
+}
+
+func MCPTools() []MCPTool {
+	out := make([]MCPTool, 0, len(Ops))
+	for _, op := range Ops {
+		if !op.MCP {
+			continue
+		}
+		props := map[string]any{}
+		var required []string
+		for _, p := range op.Params {
+			props[p.Name] = map[string]any{"type": p.Type, "description": p.Description}
+			if p.Required {
+				required = append(required, p.Name)
+			}
+		}
+		schema := map[string]any{"type": "object", "properties": props}
+		if len(required) > 0 {
+			schema["required"] = required
+		}
+		out = append(out, MCPTool{
+			Name:        op.ID,
+			Description: op.Summary,
+			InputSchema: schema,
+		})
+	}
+	return out
+}
+
+// SkillMarkdown is the Cursor skill fragment generated from Ops/MCPTools.
+func SkillMarkdown() string {
+	var b strings.Builder
+	b.WriteString("# brain HTTP / MCP tools\n\n")
+	b.WriteString("Generated from `internal/httpapi.Ops`. Do not edit by hand.\n\n")
+	b.WriteString("Serve: `bin/brain/serve.go` (`GET /openapi.json`, `POST /mcp`).\n\n")
+	for _, t := range MCPTools() {
+		b.WriteString("- `")
+		b.WriteString(t.Name)
+		b.WriteString("` — ")
+		b.WriteString(t.Description)
+		b.WriteString("\n")
+	}
+	return b.String()
+}

internal/httpapi/spec_test.go

@@ -0,0 +1,112 @@
+package httpapi
+
+import (
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+)
+
+func TestOpenAPIIncludesCorePaths(t *testing.T) {
+	doc := OpenAPI()
+	raw, err := json.Marshal(doc)
+	if err != nil {
+		t.Fatal(err)
+	}
+	paths, _ := doc["paths"].(map[string]any)
+	for _, p := range []string{"/search", "/get", "/stats", "/audit"} {
+		if _, ok := paths[p]; !ok {
+			t.Fatalf("openapi missing path %s (%s)", p, raw)
+		}
+	}
+}
+
+func TestMCPToolsMatchOpenAPIPaths(t *testing.T) {
+	paths, _ := OpenAPI()["paths"].(map[string]any)
+	tools := MCPTools()
+	if len(tools) == 0 {
+		t.Fatal("no MCP tools")
+	}
+	names := map[string]bool{}
+	for _, tool := range tools {
+		names[tool.Name] = true
+		path := "/" + tool.Name
+		if _, ok := paths[path]; !ok {
+			t.Fatalf("MCP tool %s has no OpenAPI path %s", tool.Name, path)
+		}
+	}
+	for _, need := range []string{"search", "get", "stats", "audit", "ingest"} {
+		if !names[need] {
+			t.Fatalf("MCP tools missing %s: %v", need, names)
+		}
+	}
+	var ingest MCPTool
+	for _, tool := range tools {
+		if tool.Name == "ingest" {
+			ingest = tool
+			break
+		}
+	}
+	if strings.Contains(ingest.Description, "v2") {
+		t.Fatalf("ingest still a v2 hint: %s", ingest.Description)
+	}
+	if !strings.Contains(ingest.Description, "add") {
+		t.Fatalf("ingest should describe add: %s", ingest.Description)
+	}
+}
+
+func TestOpenAPIHTTP(t *testing.T) {
+	h := NewServer(&fakeSearcher{}, 1)
+	code, body := get(t, h, "/openapi.json")
+	if code != http.StatusOK {
+		t.Fatalf("code = %d body=%s", code, body)
+	}
+	var doc map[string]any
+	if err := json.Unmarshal(body, &doc); err != nil {
+		t.Fatalf("not json: %v", err)
+	}
+	if doc["openapi"] == nil {
+		t.Fatalf("missing openapi version: %s", body)
+	}
+}
+
+func TestMCPToolsListAndCall(t *testing.T) {
+	h := NewServer(&fakeSearcher{}, 1)
+	code, body := postJSON(t, h, "/mcp", `{"jsonrpc":"2.0","id":1,"method":"tools/list"}`)
+	if code != http.StatusOK {
+		t.Fatalf("list code = %d body=%s", code, body)
+	}
+	if !strings.Contains(string(body), `"search"`) {
+		t.Fatalf("tools/list missing search: %s", body)
+	}
+	code, body = postJSON(t, h, "/mcp", `{"jsonrpc":"2.0","id":2,"method":"tools/call","params":{"name":"search","arguments":{"q":"matrix","n":3}}}`)
+	if code != http.StatusOK {
+		t.Fatalf("call code = %d body=%s", code, body)
+	}
+	if !strings.Contains(string(body), "matrix") {
+		t.Fatalf("search call body %s", body)
+	}
+}
+
+func TestSkillMarkdownMatchesCommittedFile(t *testing.T) {
+	want, err := os.ReadFile(filepath.Join("..", "..", "skills", "brain", "tools.md"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	got := SkillMarkdown()
+	if got != string(want) {
+		t.Fatalf("skills/brain/tools.md stale; regenerate from SkillMarkdown()\n--- got ---\n%s\n--- want ---\n%s", got, want)
+	}
+}
+
+func postJSON(t *testing.T, h http.Handler, path, raw string) (int, []byte) {
+	t.Helper()
+	req := httptest.NewRequest(http.MethodPost, path, strings.NewReader(raw))
+	req.Header.Set("Content-Type", "application/json")
+	rec := httptest.NewRecorder()
+	h.ServeHTTP(rec, req)
+	return rec.Code, rec.Body.Bytes()
+}

internal/mdleaves/leaf.go

@@ -0,0 +1,146 @@
+package mdleaves
+
+import (
+	"encoding/json"
+	"os"
+	"path/filepath"
+	"regexp"
+	"strings"
+)
+
+type Leaf struct {
+	Source  string `json:"source"`
+	Repo    string `json:"repo"`
+	Heading string `json:"heading"`
+	Text    string `json:"text"`
+	Type    string `json:"type"`
+	Status  string `json:"status"`
+	Related string `json:"related"`
+}
+
+type chunk struct {
+	Heading string
+	Text    string
+}
+
+var (
+	h1 = regexp.MustCompile(`^# \S`)
+	h2 = regexp.MustCompile(`^## \S`)
+)
+
+func ExtractFrontmatter(text string) (map[string]string, string) {
+	if !strings.HasPrefix(text, "---") {
+		return map[string]string{}, text
+	}
+	end := strings.Index(text[3:], "\n---")
+	if end == -1 {
+		return map[string]string{}, text
+	}
+	fm := strings.TrimSpace(text[3 : 3+end])
+	body := text[3+end+4:]
+	meta := map[string]string{}
+	for _, line := range strings.Split(fm, "\n") {
+		key, value, ok := strings.Cut(line, ":")
+		if !ok {
+			continue
+		}
+		meta[strings.TrimSpace(key)] = strings.Trim(strings.TrimSpace(value), `"'`)
+	}
+	return meta, body
+}
+
+func SplitLeafs(meta map[string]string, body string) []chunk {
+	lines := strings.Split(body, "\n")
+	title := ""
+	type hdr struct {
+		heading string
+		start   int
+	}
+	var headers []hdr
+	for i, line := range lines {
+		switch {
+		case h1.MatchString(line):
+			title = strings.TrimSpace(strings.TrimLeft(line, "#"))
+		case h2.MatchString(line):
+			headers = append(headers, hdr{strings.TrimSpace(strings.TrimLeft(line, "#")), i})
+		}
+	}
+	if len(headers) == 0 {
+		var kept []string
+		for _, l := range lines {
+			if strings.TrimSpace(l) != "" {
+				kept = append(kept, l)
+			}
+		}
+		return []chunk{{Heading: title, Text: strings.TrimSpace(strings.Join(kept, "\n"))}}
+	}
+	out := make([]chunk, 0, len(headers))
+	for idx, h := range headers {
+		end := len(lines)
+		if idx+1 < len(headers) {
+			end = headers[idx+1].start
+		}
+		var kept []string
+		for _, l := range lines[h.start:end] {
+			if strings.TrimSpace(l) != "" {
+				kept = append(kept, l)
+			}
+		}
+		text := strings.Join(kept, "\n")
+		if idx == 0 && title != "" {
+			text = title + "\n\n" + text
+		}
+		out = append(out, chunk{Heading: h.heading, Text: strings.TrimSpace(text)})
+	}
+	return out
+}
+
+func ToAll(text, path, repo string) []Leaf {
+	meta, body := ExtractFrontmatter(text)
+	if meta["type"] == "" {
+		meta["type"] = "reference"
+	}
+	if meta["status"] == "" {
+		meta["status"] = "current"
+	}
+	chunks := SplitLeafs(meta, body)
+	out := make([]Leaf, 0, len(chunks))
+	for _, c := range chunks {
+		out = append(out, Leaf{
+			Source:  path,
+			Repo:    repo,
+			Heading: c.Heading,
+			Text:    c.Text,
+			Type:    meta["type"],
+			Status:  meta["status"],
+			Related: meta["related"],
+		})
+	}
+	return out
+}
+
+func WalkMarkdown(root string) ([]string, error) {
+	var out []string
+	err := filepath.Walk(root, func(p string, info os.FileInfo, err error) error {
+		if err != nil {
+			return err
+		}
+		if info.IsDir() {
+			return nil
+		}
+		ext := strings.ToLower(filepath.Ext(p))
+		if ext == ".md" || ext == ".markdown" {
+			out = append(out, p)
+		}
+		return nil
+	})
+	return out, err
+}
+
+func EncodeJSON(leafs []Leaf) (string, error) {
+	raw, err := json.MarshalIndent(leafs, "", "  ")
+	if err != nil {
+		return "", err
+	}
+	return string(raw) + "\n", nil
+}

internal/mdleaves/leaf_test.go

@@ -0,0 +1,73 @@
+package mdleaves
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestSplitLeafsOnH2(t *testing.T) {
+	body := "# Title\n\n## One\n\nalpha\n\n## Two\n\nbeta\n"
+	leafs := SplitLeafs(map[string]string{}, body)
+	if len(leafs) != 2 {
+		t.Fatalf("n=%d", len(leafs))
+	}
+	if leafs[0].Heading != "One" || !strings.Contains(leafs[0].Text, "Title") {
+		t.Fatalf("first=%+v", leafs[0])
+	}
+	if leafs[1].Heading != "Two" || strings.Contains(leafs[1].Text, "Title") {
+		t.Fatalf("second=%+v", leafs[1])
+	}
+}
+
+func TestSplitLeafsNoH2IsWholeDoc(t *testing.T) {
+	body := "# Title\n\njust a paragraph\n"
+	leafs := SplitLeafs(nil, body)
+	if len(leafs) != 1 {
+		t.Fatalf("n=%d", len(leafs))
+	}
+	if leafs[0].Heading != "Title" {
+		t.Fatalf("heading=%q", leafs[0].Heading)
+	}
+	if !strings.Contains(leafs[0].Text, "just a paragraph") {
+		t.Fatalf("text=%q", leafs[0].Text)
+	}
+}
+
+func TestFrontmatterAndToAll(t *testing.T) {
+	raw := "---\ntype: howto\nstatus: current\nrelated: docs/design.md\n---\n# Doc\n\n## Step\n\ndo it\n"
+	got := ToAll(raw, "docs/x.md", "eSlider/2dph")
+	if len(got) != 1 {
+		t.Fatalf("n=%d", len(got))
+	}
+	if got[0].Type != "howto" || got[0].Status != "current" {
+		t.Fatalf("%+v", got[0])
+	}
+	if got[0].Source != "docs/x.md" || got[0].Repo != "eSlider/2dph" {
+		t.Fatalf("%+v", got[0])
+	}
+	if got[0].Related != "docs/design.md" {
+		t.Fatalf("related=%q", got[0].Related)
+	}
+}
+
+func TestEncodeJSONAndYAML(t *testing.T) {
+	leafs := ToAll("# Hi\n\nbody\n", "a.md", "")
+	js, err := EncodeJSON(leafs)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !strings.Contains(js, `"heading": "Hi"`) {
+		t.Fatalf("json=%s", js)
+	}
+	y := EncodeYAML(leafs)
+	if !strings.Contains(y, "heading: Hi") {
+		t.Fatalf("yaml=%s", y)
+	}
+}
+
+func TestDefaultsTypeAndStatus(t *testing.T) {
+	got := ToAll("# Hi\n\nbody\n", "a.md", "")
+	if got[0].Type != "reference" || got[0].Status != "current" {
+		t.Fatalf("%+v", got[0])
+	}
+}

internal/mdleaves/yaml.go

@@ -0,0 +1,36 @@
+package mdleaves
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+)
+
+func EncodeYAML(leafs []Leaf) string {
+	if len(leafs) == 0 {
+		return "[]\n"
+	}
+	var b strings.Builder
+	for _, lf := range leafs {
+		b.WriteString("-\n")
+		writeKV(&b, "source", lf.Source)
+		writeKV(&b, "repo", lf.Repo)
+		writeKV(&b, "heading", lf.Heading)
+		writeKV(&b, "text", lf.Text)
+		writeKV(&b, "type", lf.Type)
+		writeKV(&b, "status", lf.Status)
+		writeKV(&b, "related", lf.Related)
+	}
+	return b.String()
+}
+
+func writeKV(b *strings.Builder, k, v string) {
+	fmt.Fprintf(b, "  %s: %s\n", k, yamlScalar(v))
+}
+
+func yamlScalar(s string) string {
+	if strings.Contains(s, "\n") || s == "" || strings.ContainsAny(s, ":#'\"[]{}&*!|>%@`") || s != strings.TrimSpace(s) {
+		return strconv.Quote(s)
+	}
+	return s
+}

internal/ocr/ocr.go

@@ -0,0 +1,162 @@
+// Package ocr runs Tesseract (eng+deu) on images and scanned PDFs.
+//
+// Default engine is the tesseract CLI, not gosseract CGO: Ladybug CGO stays
+// Zig-only (D21). Same engine, no gocv. OCR_ENGINE=paddle selects paddleocr
+// when that binary is on PATH (compose profile ocr-paddle).
+package ocr
+
+import (
+	"fmt"
+	"image"
+	"image/color"
+	"image/png"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+)
+
+const TessLang = "eng+deu"
+
+func ImageFile(path string) (string, error) {
+	engine := os.Getenv("OCR_ENGINE")
+	if engine == "paddle" {
+		return runPaddle(path)
+	}
+	return runTesseract(path)
+}
+
+func PDFFile(path string) (string, error) {
+	text, err := pdfToText(path)
+	if err == nil && strings.TrimSpace(text) != "" {
+		return strings.TrimSpace(text), nil
+	}
+	ocr, oerr := pdfPages(path)
+	if oerr != nil {
+		if err != nil {
+			return "", err
+		}
+		return "", oerr
+	}
+	if strings.TrimSpace(ocr) != "" {
+		return strings.TrimSpace(ocr), nil
+	}
+	if text != "" {
+		return strings.TrimSpace(text), nil
+	}
+	return "", fmt.Errorf("pdf has no text layer (ocr unavailable)")
+}
+
+func pdfToText(path string) (string, error) {
+	cmd := exec.Command("pdftotext", "-layout", path, "-")
+	out, err := cmd.Output()
+	if err != nil {
+		return "", err
+	}
+	return string(out), nil
+}
+
+func pdfPages(path string) (string, error) {
+	dir, err := os.MkdirTemp("", "2dph-ocr-")
+	if err != nil {
+		return "", err
+	}
+	defer os.RemoveAll(dir)
+	prefix := filepath.Join(dir, "page")
+	cmd := exec.Command("pdftoppm", "-png", "-r", "200", path, prefix)
+	if err := cmd.Run(); err != nil {
+		return "", err
+	}
+	matches, err := filepath.Glob(prefix + "*.png")
+	if err != nil {
+		return "", err
+	}
+	var parts []string
+	for _, img := range matches {
+		t, err := ImageFile(img)
+		if err != nil {
+			continue
+		}
+		if s := strings.TrimSpace(t); s != "" {
+			parts = append(parts, s)
+		}
+	}
+	return strings.Join(parts, "\n\n"), nil
+}
+
+func runTesseract(path string) (string, error) {
+	pre, err := preprocessFile(path)
+	if err != nil {
+		pre = path
+	} else {
+		defer os.Remove(pre)
+	}
+	cmd := exec.Command("tesseract", pre, "stdout", "-l", TessLang, "--psm", "6")
+	out, err := cmd.Output()
+	if err != nil {
+		return "", err
+	}
+	return strings.TrimSpace(string(out)), nil
+}
+
+func runPaddle(path string) (string, error) {
+	cmd := exec.Command("paddleocr", "ocr", "-i", path)
+	out, err := cmd.Output()
+	if err != nil {
+		return "", err
+	}
+	return strings.TrimSpace(string(out)), nil
+}
+
+func preprocessFile(path string) (string, error) {
+	f, err := os.Open(path)
+	if err != nil {
+		return "", err
+	}
+	defer f.Close()
+	img, err := png.Decode(f)
+	if err != nil {
+		return "", err
+	}
+	out := filepath.Join(os.TempDir(), filepath.Base(path)+".gray.png")
+	w, err := os.Create(out)
+	if err != nil {
+		return "", err
+	}
+	defer w.Close()
+	if err := png.Encode(w, GrayContrast(img)); err != nil {
+		os.Remove(out)
+		return "", err
+	}
+	return out, nil
+}
+
+// GrayContrast is a stdlib preprocess (no gocv): grayscale + stretch.
+func GrayContrast(src image.Image) image.Image {
+	b := src.Bounds()
+	dst := image.NewGray(b)
+	var minL, maxL uint8 = 255, 0
+	for y := b.Min.Y; y < b.Max.Y; y++ {
+		for x := b.Min.X; x < b.Max.X; x++ {
+			g := color.GrayModel.Convert(src.At(x, y)).(color.Gray)
+			if g.Y < minL {
+				minL = g.Y
+			}
+			if g.Y > maxL {
+				maxL = g.Y
+			}
+		}
+	}
+	span := int(maxL) - int(minL)
+	if span < 1 {
+		span = 1
+	}
+	for y := b.Min.Y; y < b.Max.Y; y++ {
+		for x := b.Min.X; x < b.Max.X; x++ {
+			g := color.GrayModel.Convert(src.At(x, y)).(color.Gray)
+			v := uint8((int(g.Y) - int(minL)) * 255 / span)
+			dst.SetGray(x, y, color.Gray{Y: v})
+		}
+	}
+	return dst
+}

internal/ocr/ocr_test.go

@@ -0,0 +1,54 @@
+package ocr
+
+import (
+	"image"
+	"image/color"
+	"os/exec"
+	"path/filepath"
+	"strings"
+	"testing"
+)
+
+func TestGrayContrastStretches(t *testing.T) {
+	img := image.NewGray(image.Rect(0, 0, 2, 2))
+	img.SetGray(0, 0, color.Gray{Y: 64})
+	img.SetGray(0, 1, color.Gray{Y: 64})
+	img.SetGray(1, 0, color.Gray{Y: 64})
+	img.SetGray(1, 1, color.Gray{Y: 192})
+	out := GrayContrast(img).(*image.Gray)
+	if out.GrayAt(0, 0).Y != 0 {
+		t.Fatalf("min should map to 0, got %d", out.GrayAt(0, 0).Y)
+	}
+	if out.GrayAt(1, 1).Y != 255 {
+		t.Fatalf("max should map to 255, got %d", out.GrayAt(1, 1).Y)
+	}
+}
+
+func TestHelloPNGFixtureOCR(t *testing.T) {
+	if _, err := exec.LookPath("tesseract"); err != nil {
+		t.Skip("tesseract not installed")
+	}
+	path := filepath.Join("testdata", "hello.png")
+	got, err := ImageFile(path)
+	if err != nil {
+		t.Fatal(err)
+	}
+	up := strings.ToUpper(got)
+	if !strings.Contains(up, "HELLO") {
+		t.Fatalf("ocr %q missing HELLO", got)
+	}
+}
+
+func TestPaddleEngineUsesPaddleocrBinary(t *testing.T) {
+	t.Setenv("OCR_ENGINE", "paddle")
+	_, err := ImageFile(filepath.Join("testdata", "hello.png"))
+	if _, look := exec.LookPath("paddleocr"); look != nil {
+		if err == nil {
+			t.Fatal("expected error when paddleocr is missing")
+		}
+		return
+	}
+	if err != nil {
+		t.Fatal(err)
+	}
+}

internal/reasoner/client.go

@@ -0,0 +1,327 @@
+package reasoner
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"strings"
+	"time"
+)
+
+// HF IDs named in docs. No Qwen3.6-9B exists.
+const (
+	HFQwen35_9B   = "Qwen/Qwen3.5-9B"
+	HFQwen36_27B  = "Qwen/Qwen3.6-27B"
+	HFBonsai27B   = "prism-ml/Bonsai-27B-gguf"
+	OllamaRAM     = "qwen3.5:9b"
+	OllamaQuality = "MichelRosselli/bonsai-27b:Q1_0"
+)
+
+type ToolCall struct {
+	Name      string
+	Arguments string
+}
+
+type Result struct {
+	Model      string `json:"model"`
+	OK         bool   `json:"ok"`
+	ToolName   string `json:"tool_name,omitempty"`
+	XMLLeak    bool   `json:"xml_leak"`
+	Err        string `json:"error,omitempty"`
+	LatencyMS  int64  `json:"latency_ms"`
+	RSSMB      int    `json:"rss_mb,omitempty"`
+	Device     string `json:"device"`
+	WantedTool string `json:"wanted_tool"`
+}
+
+type Prompt struct {
+	Name string
+	Want string
+	User string
+}
+
+var BakePrompts = []Prompt{
+	{
+		Name: "search-before-claim",
+		Want: "search",
+		User: "Use tools. Search the 2dph brain for LadybugDB before you answer. Call search.",
+	},
+	{
+		Name: "get-leaf",
+		Want: "get",
+		User: "Use tools. Fetch leaf id leaf-demo with get. Do not invent the body.",
+	},
+	{
+		Name: "audit-index",
+		Want: "audit",
+		User: "Use tools. Call audit on the brain index health.",
+	},
+}
+
+func MCPTools() []map[string]any {
+	return []map[string]any{
+		openaiTool("search", "deduction search (facts → info → web)", map[string]any{
+			"type": "object",
+			"properties": map[string]any{
+				"q": map[string]any{"type": "string", "description": "search query"},
+				"n": map[string]any{"type": "integer"},
+			},
+			"required": []string{"q"},
+		}),
+		openaiTool("get", "read one leaf by id", map[string]any{
+			"type": "object",
+			"properties": map[string]any{
+				"id":   map[string]any{"type": "string"},
+				"body": map[string]any{"type": "boolean"},
+			},
+			"required": []string{"id"},
+		}),
+		openaiTool("audit", "facts confidence histogram", map[string]any{
+			"type":       "object",
+			"properties": map[string]any{},
+		}),
+	}
+}
+
+func openaiTool(name, desc string, schema map[string]any) map[string]any {
+	return map[string]any{
+		"type": "function",
+		"function": map[string]any{
+			"name":        name,
+			"description": desc,
+			"parameters":  schema,
+		},
+	}
+}
+
+type Client struct {
+	BaseURL    string
+	Model      string
+	HTTP       *http.Client
+	Device     string
+	ToolChoice string
+}
+
+type Report struct {
+	Model        string   `json:"model"`
+	HF           string   `json:"hf_id"`
+	Device       string   `json:"device"`
+	ToolCallOK   int      `json:"tool_call_ok"`
+	ToolCallN    int      `json:"tool_call_n"`
+	XMLLeak      int      `json:"xml_leak"`
+	RSSMB        int      `json:"rss_mb"`
+	VRAMMB       int      `json:"vram_mb"`
+	LatencyP50MS float64  `json:"latency_p50_ms,omitempty"`
+	LatencyP95MS float64  `json:"latency_p95_ms,omitempty"`
+	Prompts      []Result `json:"prompts"`
+}
+
+func HFFor(model string) string {
+	switch model {
+	case OllamaRAM:
+		return HFQwen35_9B
+	case OllamaQuality:
+		return HFBonsai27B
+	default:
+		if strings.Contains(model, "qwen3.6") || strings.Contains(model, "Qwen3.6") {
+			return HFQwen36_27B
+		}
+		return ""
+	}
+}
+
+func (c *Client) httpc() *http.Client {
+	if c.HTTP == nil {
+		c.HTTP = &http.Client{Timeout: 10 * time.Minute}
+	}
+	return c.HTTP
+}
+
+func Origin(base string) string {
+	s := strings.TrimRight(base, "/")
+	return strings.TrimSuffix(s, "/v1")
+}
+
+func (c Client) ChatTools(user string) (ToolCall, string, error) {
+	choice := c.ToolChoice
+	if choice == "" {
+		choice = "required"
+	}
+	body, _ := json.Marshal(map[string]any{
+		"model": c.Model,
+		"messages": []map[string]string{
+			{"role": "system", "content": "You are PicoClaw talking to 2dph MCP. Always call a tool before a factual claim. search then get then audit."},
+			{"role": "user", "content": user},
+		},
+		"tools":       MCPTools(),
+		"tool_choice": choice,
+	})
+	base := strings.TrimRight(c.BaseURL, "/")
+	if !strings.HasSuffix(base, "/v1") {
+		base += "/v1"
+	}
+	url := base + "/chat/completions"
+	req, err := http.NewRequest(http.MethodPost, url, bytes.NewReader(body))
+	if err != nil {
+		return ToolCall{}, "", err
+	}
+	req.Header.Set("Content-Type", "application/json")
+	res, err := c.httpc().Do(req)
+	if err != nil {
+		return ToolCall{}, "", err
+	}
+	defer res.Body.Close()
+	raw, _ := io.ReadAll(res.Body)
+	if res.StatusCode >= 300 {
+		return ToolCall{}, string(raw), fmt.Errorf("http %d", res.StatusCode)
+	}
+	return ParseToolResponse(raw)
+}
+
+func ParseToolResponse(raw []byte) (ToolCall, string, error) {
+	var wrap struct {
+		Choices []struct {
+			Message struct {
+				Content   string `json:"content"`
+				ToolCalls []struct {
+					Function struct {
+						Name      string          `json:"name"`
+						Arguments json.RawMessage `json:"arguments"`
+					} `json:"function"`
+				} `json:"tool_calls"`
+			} `json:"message"`
+		} `json:"choices"`
+	}
+	if err := json.Unmarshal(raw, &wrap); err != nil {
+		return ToolCall{}, "", err
+	}
+	content := ""
+	if len(wrap.Choices) > 0 {
+		content = wrap.Choices[0].Message.Content
+		if n := len(wrap.Choices[0].Message.ToolCalls); n > 0 {
+			fn := wrap.Choices[0].Message.ToolCalls[0].Function
+			return ToolCall{Name: fn.Name, Arguments: rawArgs(fn.Arguments)}, content, nil
+		}
+	}
+	return ToolCall{}, content, fmt.Errorf("no tool_calls")
+}
+
+func rawArgs(raw json.RawMessage) string {
+	if len(raw) == 0 {
+		return ""
+	}
+	var s string
+	if err := json.Unmarshal(raw, &s); err == nil {
+		return s
+	}
+	return string(raw)
+}
+
+func XMLLeak(content string) bool {
+	s := strings.ToLower(content)
+	return strings.Contains(s, "<tool_call>") ||
+		strings.Contains(s, "<function=") ||
+		strings.Contains(s, "<parameter")
+}
+
+func RunPrompt(c Client, p Prompt) Result {
+	start := time.Now()
+	tc, content, err := c.ChatTools(p.User)
+	out := Result{
+		Model:      c.Model,
+		WantedTool: p.Want,
+		LatencyMS:  time.Since(start).Milliseconds(),
+		Device:     c.Device,
+		XMLLeak:    XMLLeak(content),
+	}
+	if err != nil {
+		out.Err = err.Error()
+		if content != "" && out.XMLLeak {
+			out.Err = "xml tool call instead of openai tool_calls"
+		}
+		return out
+	}
+	out.ToolName = tc.Name
+	out.OK = tc.Name == p.Want
+	if !out.OK {
+		out.Err = "wanted " + p.Want + " got " + tc.Name
+	}
+	return out
+}
+
+type ProcMem struct {
+	Name   string
+	SizeMB int
+	VRAMMB int
+}
+
+func ParsePS(raw []byte) []ProcMem {
+	var wrap struct {
+		Models []struct {
+			Name     string `json:"name"`
+			Size     int64  `json:"size"`
+			SizeVRAM int64  `json:"size_vram"`
+		} `json:"models"`
+	}
+	if err := json.Unmarshal(raw, &wrap); err != nil {
+		return nil
+	}
+	out := make([]ProcMem, 0, len(wrap.Models))
+	for _, m := range wrap.Models {
+		out = append(out, ProcMem{
+			Name:   m.Name,
+			SizeMB: int(m.Size / (1024 * 1024)),
+			VRAMMB: int(m.SizeVRAM / (1024 * 1024)),
+		})
+	}
+	return out
+}
+
+func (c Client) FetchPS() []ProcMem {
+	url := Origin(c.BaseURL) + "/api/ps"
+	res, err := c.httpc().Get(url)
+	if err != nil {
+		return nil
+	}
+	defer res.Body.Close()
+	raw, _ := io.ReadAll(res.Body)
+	if res.StatusCode >= 300 {
+		return nil
+	}
+	return ParsePS(raw)
+}
+
+func Run(c Client) Report {
+	if c.Device == "" {
+		c.Device = "cpu"
+	}
+	rep := Report{
+		Model:  c.Model,
+		HF:     HFFor(c.Model),
+		Device: c.Device,
+	}
+	for _, p := range BakePrompts {
+		r := RunPrompt(c, p)
+		rep.Prompts = append(rep.Prompts, r)
+		rep.ToolCallN++
+		if r.OK {
+			rep.ToolCallOK++
+		}
+		if r.XMLLeak {
+			rep.XMLLeak++
+		}
+	}
+	if mems := c.FetchPS(); len(mems) > 0 {
+		rep.RSSMB = mems[0].SizeMB
+		rep.VRAMMB = mems[0].VRAMMB
+		if c.Device == "cpu" && mems[0].VRAMMB > 0 {
+			rep.Device = "gpu"
+		}
+		for i := range rep.Prompts {
+			rep.Prompts[i].RSSMB = rep.RSSMB
+		}
+	}
+	return rep
+}

internal/reasoner/client_test.go

@@ -0,0 +1,166 @@
+package reasoner
+
+import (
+	"encoding/json"
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+
+	"github.com/eSlider/2dph/internal/httpapi"
+)
+
+func TestHFIdsAreRealAndNoQwen36Nine(t *testing.T) {
+	if HFQwen35_9B != "Qwen/Qwen3.5-9B" {
+		t.Fatalf("9B id = %s", HFQwen35_9B)
+	}
+	if HFQwen36_27B != "Qwen/Qwen3.6-27B" {
+		t.Fatalf("27B id = %s", HFQwen36_27B)
+	}
+	if HFBonsai27B != "prism-ml/Bonsai-27B-gguf" {
+		t.Fatalf("bonsai id = %s", HFBonsai27B)
+	}
+}
+
+func TestParseToolResponseOpenAI(t *testing.T) {
+	raw := []byte(`{"choices":[{"message":{"tool_calls":[{"function":{"name":"search","arguments":"{\"q\":\"LadybugDB\"}"}}]}}]}`)
+	tc, _, err := ParseToolResponse(raw)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if tc.Name != "search" {
+		t.Fatalf("name=%s", tc.Name)
+	}
+}
+
+func TestParseToolResponseXMLIsFailure(t *testing.T) {
+	raw := []byte(`{"choices":[{"message":{"content":"<tool_call>search</tool_call>"}}]}`)
+	_, content, err := ParseToolResponse(raw)
+	if err == nil {
+		t.Fatal("expected no tool_calls")
+	}
+	if !XMLLeak(content) {
+		t.Fatal("xml leak not detected")
+	}
+}
+
+func TestBakePromptsWantMCPTools(t *testing.T) {
+	if len(BakePrompts) != 3 {
+		t.Fatalf("prompts=%d", len(BakePrompts))
+	}
+	names := map[string]bool{}
+	for _, p := range BakePrompts {
+		names[p.Want] = true
+	}
+	for _, n := range []string{"search", "get", "audit"} {
+		if !names[n] {
+			t.Fatalf("missing want %s", n)
+		}
+	}
+}
+
+func TestParseToolResponseObjectArgs(t *testing.T) {
+	raw := []byte(`{"choices":[{"message":{"tool_calls":[{"function":{"name":"get","arguments":{"id":"leaf-demo"}}}]}}]}`)
+	tc, _, err := ParseToolResponse(raw)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if tc.Name != "get" {
+		t.Fatalf("name=%s", tc.Name)
+	}
+	if !strings.Contains(tc.Arguments, "leaf-demo") {
+		t.Fatalf("args=%s", tc.Arguments)
+	}
+}
+
+func TestParsePSCPUNotVRAM(t *testing.T) {
+	raw := []byte(`{"models":[{"name":"qwen3.5:9b","size":6900000000,"size_vram":0}]}`)
+	got := ParsePS(raw)
+	if len(got) != 1 {
+		t.Fatalf("n=%d", len(got))
+	}
+	if got[0].VRAMMB != 0 {
+		t.Fatalf("vram=%d", got[0].VRAMMB)
+	}
+	if got[0].SizeMB < 6000 {
+		t.Fatalf("rss=%d", got[0].SizeMB)
+	}
+}
+
+func TestMCPToolsArePicoClawSubset(t *testing.T) {
+	mcp := map[string]bool{}
+	for _, op := range httpapi.Ops {
+		if op.MCP {
+			mcp[op.ID] = true
+		}
+	}
+	seen := map[string]bool{}
+	for _, tool := range MCPTools() {
+		fn, _ := tool["function"].(map[string]any)
+		name, _ := fn["name"].(string)
+		if !mcp[name] {
+			t.Fatalf("%s is not an MCP op", name)
+		}
+		seen[name] = true
+	}
+	for _, n := range []string{"search", "get", "audit"} {
+		if !seen[n] {
+			t.Fatalf("bake-off missing %s", n)
+		}
+	}
+}
+
+func TestChatToolsHitsOpenAIPath(t *testing.T) {
+	var gotTools bool
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Path != "/v1/chat/completions" {
+			t.Errorf("path=%s", r.URL.Path)
+		}
+		body, _ := io.ReadAll(r.Body)
+		var payload map[string]any
+		_ = json.Unmarshal(body, &payload)
+		if _, ok := payload["tools"]; ok {
+			gotTools = true
+		}
+		w.Header().Set("Content-Type", "application/json")
+		_, _ = w.Write([]byte(`{"choices":[{"message":{"tool_calls":[{"function":{"name":"search","arguments":"{\"q\":\"LadybugDB\"}"}}]}}]}`))
+	}))
+	defer srv.Close()
+	c := Client{BaseURL: srv.URL + "/v1", Model: "stub", HTTP: srv.Client(), Device: "cpu"}
+	r := RunPrompt(c, BakePrompts[0])
+	if !gotTools {
+		t.Fatal("tools not sent")
+	}
+	if !r.OK {
+		t.Fatalf("result=%+v", r)
+	}
+}
+
+func TestRunSamplesPSAfterPrompts(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		if r.URL.Path == "/api/ps" {
+			_, _ = w.Write([]byte(`{"models":[{"name":"stub","size":6500000000,"size_vram":0}]}`))
+			return
+		}
+		_, _ = w.Write([]byte(`{"choices":[{"message":{"tool_calls":[{"function":{"name":"search","arguments":"{}"}}]}}]}`))
+	}))
+	defer srv.Close()
+	c := Client{BaseURL: srv.URL + "/v1", Model: "stub", HTTP: srv.Client(), Device: "cpu"}
+	if mems := c.FetchPS(); len(mems) != 1 || mems[0].VRAMMB != 0 {
+		t.Fatalf("%+v", mems)
+	}
+	if mems := c.FetchPS(); mems[0].SizeMB < 6000 {
+		t.Fatalf("rss=%d", mems[0].SizeMB)
+	}
+}
+
+func TestHFForKnownOllamaTags(t *testing.T) {
+	if HFFor(OllamaRAM) != HFQwen35_9B {
+		t.Fatal(HFFor(OllamaRAM))
+	}
+	if HFFor(OllamaQuality) != HFBonsai27B {
+		t.Fatal(HFFor(OllamaQuality))
+	}
+}

internal/websearch/cache.go

@@ -0,0 +1,97 @@
+package websearch
+
+import (
+	"database/sql"
+	"encoding/json"
+	"os"
+	"path/filepath"
+
+	_ "modernc.org/sqlite"
+)
+
+const cacheSchema = `
+CREATE TABLE IF NOT EXISTS responses (
+  key     TEXT PRIMARY KEY,
+  fetched REAL NOT NULL,
+  payload TEXT NOT NULL
+);
+CREATE TABLE IF NOT EXISTS meta (
+  key   TEXT PRIMARY KEY,
+  value REAL NOT NULL
+);
+`
+
+type Cache struct {
+	db *sql.DB
+}
+
+func OpenCache(path string) (*Cache, error) {
+	if err := os.MkdirAll(filepath.Dir(path), 0o700); err != nil {
+		return nil, err
+	}
+	db, err := sql.Open("sqlite", path)
+	if err != nil {
+		return nil, err
+	}
+	if _, err := db.Exec(cacheSchema); err != nil {
+		db.Close()
+		return nil, err
+	}
+	return &Cache{db: db}, nil
+}
+
+func (c *Cache) Close() error {
+	if c == nil || c.db == nil {
+		return nil
+	}
+	return c.db.Close()
+}
+
+func (c *Cache) Get(key string, ttl, now float64) (*Payload, error) {
+	var fetched float64
+	var raw string
+	err := c.db.QueryRow("SELECT fetched, payload FROM responses WHERE key = ?", key).Scan(&fetched, &raw)
+	if err == sql.ErrNoRows {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, err
+	}
+	if now-fetched > ttl {
+		return nil, nil
+	}
+	var p Payload
+	if err := json.Unmarshal([]byte(raw), &p); err != nil {
+		return nil, err
+	}
+	return &p, nil
+}
+
+func (c *Cache) Put(key string, p Payload, now float64) error {
+	raw, err := json.Marshal(p)
+	if err != nil {
+		return err
+	}
+	_, err = c.db.Exec(
+		"INSERT OR REPLACE INTO responses (key, fetched, payload) VALUES (?, ?, ?)",
+		key, now, string(raw),
+	)
+	return err
+}
+
+func (c *Cache) LastCall() (*float64, error) {
+	var v float64
+	err := c.db.QueryRow("SELECT value FROM meta WHERE key = 'last_call'").Scan(&v)
+	if err == sql.ErrNoRows {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, err
+	}
+	return &v, nil
+}
+
+func (c *Cache) MarkCall(now float64) error {
+	_, err := c.db.Exec("INSERT OR REPLACE INTO meta (key, value) VALUES ('last_call', ?)", now)
+	return err
+}

internal/websearch/fetch.go

@@ -0,0 +1,90 @@
+package websearch
+
+import (
+	"encoding/base64"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"os"
+	"strings"
+	"time"
+)
+
+type Config struct {
+	URL  string
+	User string
+	Pass string
+}
+
+func LoadConfig(path string) (Config, error) {
+	raw, err := os.ReadFile(path)
+	if err != nil {
+		return Config{}, fmt.Errorf("no credentials at %s (mode 600, BRAIN_SEARCH_URL)", path)
+	}
+	conf := map[string]string{}
+	for _, line := range strings.Split(string(raw), "\n") {
+		line = strings.TrimSpace(line)
+		if line == "" || strings.HasPrefix(line, "#") || !strings.Contains(line, "=") {
+			continue
+		}
+		k, v, _ := strings.Cut(line, "=")
+		v = strings.TrimSpace(v)
+		v = strings.Trim(v, `"'`)
+		conf[strings.TrimSpace(k)] = v
+	}
+	out := Config{
+		URL:  conf["BRAIN_SEARCH_URL"],
+		User: conf["BRAIN_SEARCH_USER"],
+		Pass: conf["BRAIN_SEARCH_PASS"],
+	}
+	if out.URL == "" {
+		return Config{}, fmt.Errorf("%s is missing BRAIN_SEARCH_URL", path)
+	}
+	return out, nil
+}
+
+func Fetch(client *http.Client, conf Config, query string, params map[string]string, timeout time.Duration) (Payload, error) {
+	if client == nil {
+		client = &http.Client{Timeout: timeout}
+	} else if timeout > 0 {
+		c := *client
+		c.Timeout = timeout
+		client = &c
+	}
+	q := url.Values{}
+	q.Set("q", query)
+	q.Set("format", "json")
+	for k, v := range params {
+		if v != "" {
+			q.Set(k, v)
+		}
+	}
+	u := strings.TrimRight(conf.URL, "/") + "/search?" + q.Encode()
+	req, err := http.NewRequest(http.MethodGet, u, nil)
+	if err != nil {
+		return Payload{}, err
+	}
+	if conf.User != "" || conf.Pass != "" {
+		token := base64.StdEncoding.EncodeToString([]byte(conf.User + ":" + conf.Pass))
+		req.Header.Set("Authorization", "Basic "+token)
+	}
+	resp, err := client.Do(req)
+	if err != nil {
+		return Payload{}, err
+	}
+	defer resp.Body.Close()
+	body, err := io.ReadAll(io.LimitReader(resp.Body, 8<<20))
+	if err != nil {
+		return Payload{}, err
+	}
+	if resp.StatusCode >= 400 {
+		return Payload{}, fmt.Errorf("HTTP %d", resp.StatusCode)
+	}
+	var p Payload
+	if err := json.Unmarshal(body, &p); err != nil {
+		return Payload{}, err
+	}
+	return p, nil
+}

internal/websearch/fetch_test.go

@@ -0,0 +1,77 @@
+package websearch
+
+import (
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"path/filepath"
+	"testing"
+	"time"
+)
+
+func TestLoadConfigRequiresURL(t *testing.T) {
+	dir := t.TempDir()
+	p := filepath.Join(dir, "search.env")
+	if err := os.WriteFile(p, []byte("BRAIN_SEARCH_USER=x\n"), 0o600); err != nil {
+		t.Fatal(err)
+	}
+	if _, err := LoadConfig(p); err == nil {
+		t.Fatal("expected missing URL error")
+	}
+}
+
+func TestLoadConfigOptionalAuth(t *testing.T) {
+	dir := t.TempDir()
+	p := filepath.Join(dir, "search.env")
+	if err := os.WriteFile(p, []byte("BRAIN_SEARCH_URL=http://127.0.0.1:8080\n"), 0o600); err != nil {
+		t.Fatal(err)
+	}
+	c, err := LoadConfig(p)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if c.URL != "http://127.0.0.1:8080" || c.User != "" || c.Pass != "" {
+		t.Fatalf("%+v", c)
+	}
+}
+
+func TestFetchJSONNoBasicAuth(t *testing.T) {
+	payload := Payload{Query: "x", Results: []RawHit{{Title: "t", URL: "http://example.com", Content: "c", Engine: "bing"}}}
+	var sawAuth string
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		sawAuth = r.Header.Get("Authorization")
+		if r.URL.Query().Get("format") != "json" || r.URL.Query().Get("q") != "x" {
+			t.Errorf("query = %s", r.URL.RawQuery)
+		}
+		w.Header().Set("Content-Type", "application/json")
+		json.NewEncoder(w).Encode(payload)
+	}))
+	defer srv.Close()
+	got, err := Fetch(srv.Client(), Config{URL: srv.URL}, "x", nil, 2*time.Second)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if sawAuth != "" {
+		t.Fatalf("Authorization = %q, want empty for local instance", sawAuth)
+	}
+	if Classify(got) != StatusOK {
+		t.Fatalf("classify = %s", Classify(got))
+	}
+}
+
+func TestFetchSendsBasicAuthWhenConfigured(t *testing.T) {
+	var sawAuth string
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		sawAuth = r.Header.Get("Authorization")
+		w.Write([]byte(`{"query":"x","results":[]}`))
+	}))
+	defer srv.Close()
+	_, err := Fetch(srv.Client(), Config{URL: srv.URL, User: "u", Pass: "p"}, "x", nil, 2*time.Second)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if sawAuth == "" {
+		t.Fatal("expected Basic auth")
+	}
+}

internal/websearch/lookup.go

@@ -0,0 +1,122 @@
+package websearch
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+	"os"
+	"time"
+
+	"golang.org/x/sys/unix"
+)
+
+const (
+	StatusSkipped = "skipped"
+	StatusRefused = "refused"
+)
+
+type LookupOpt struct {
+	Limit     int
+	Timeout   time.Duration
+	EnvPath   string
+	CachePath string
+	Client    *http.Client
+	Now       func() float64
+	Sleep     func(context.Context, time.Duration) error
+}
+
+func Lookup(ctx context.Context, query string, opt LookupOpt) Output {
+	if ctx == nil {
+		ctx = context.Background()
+	}
+	if opt.Limit <= 0 {
+		opt.Limit = DefaultLimit
+	}
+	if opt.Timeout <= 0 {
+		opt.Timeout = 25 * time.Second
+	}
+	nowFn := opt.Now
+	if nowFn == nil {
+		nowFn = func() float64 { return float64(time.Now().Unix()) }
+	}
+	sleepFn := opt.Sleep
+	if sleepFn == nil {
+		sleepFn = func(ctx context.Context, d time.Duration) error {
+			t := time.NewTimer(d)
+			defer t.Stop()
+			select {
+			case <-t.C:
+				return nil
+			case <-ctx.Done():
+				return ctx.Err()
+			}
+		}
+	}
+
+	if reason := PHIReason(query); reason != "" {
+		return Output{Query: query, Status: StatusRefused, Note: reason}
+	}
+
+	cachePath := opt.CachePath
+	if cachePath == "" {
+		cachePath = os.Getenv("BRAIN_SEARCH_CACHE")
+	}
+	if cachePath == "" {
+		cachePath = os.Getenv("HOME") + "/.cache/brain/web-search.sqlite"
+	}
+	cache, err := OpenCache(cachePath)
+	if err != nil {
+		return Output{Query: query, Status: StatusSkipped, Note: "cache: " + err.Error()}
+	}
+	defer cache.Close()
+
+	key := CacheKey(query, nil)
+	now := nowFn()
+	if cached, err := cache.Get(key, CacheTTL, now); err == nil && cached != nil {
+		out := Project(*cached, opt.Limit, DefaultSnippetChars)
+		out.Cached = true
+		return out
+	}
+
+	envPath := opt.EnvPath
+	if envPath == "" {
+		envPath = os.Getenv("BRAIN_SEARCH_ENV")
+	}
+	if envPath == "" {
+		envPath = os.Getenv("HOME") + "/.config/brain/search.env"
+	}
+	conf, err := LoadConfig(envPath)
+	if err != nil {
+		return Output{Query: query, Status: StatusSkipped, Note: "no BRAIN_SEARCH_URL; second source not consulted"}
+	}
+
+	lock, err := os.OpenFile(cachePath+".lock", os.O_CREATE|os.O_RDWR, 0o600)
+	if err != nil {
+		return Output{Query: query, Status: StatusSkipped, Note: "lock: " + err.Error()}
+	}
+	defer lock.Close()
+	if err := unix.Flock(int(lock.Fd()), unix.LOCK_EX); err != nil {
+		return Output{Query: query, Status: StatusSkipped, Note: "lock: " + err.Error()}
+	}
+	defer unix.Flock(int(lock.Fd()), unix.LOCK_UN)
+
+	last, err := cache.LastCall()
+	if err != nil {
+		return Output{Query: query, Status: StatusSkipped, Note: "cache: " + err.Error()}
+	}
+	if delay := WaitFor(last, nowFn(), MinInterval); delay > 0 {
+		if err := sleepFn(ctx, time.Duration(delay*float64(time.Second))); err != nil {
+			return Output{Query: query, Status: StatusSkipped, Note: "cancelled"}
+		}
+	}
+	_ = cache.MarkCall(nowFn())
+
+	payload, err := Fetch(opt.Client, conf, query, nil, opt.Timeout)
+	if err != nil {
+		return Output{Query: query, Status: StatusThrottled, Note: fmt.Sprintf("request failed: %v", err)}
+	}
+	if Classify(payload) == StatusOK {
+		_ = cache.Put(key, payload, nowFn())
+	}
+	return Project(payload, opt.Limit, DefaultSnippetChars)
+}

internal/websearch/lookup_test.go

@@ -0,0 +1,97 @@
+package websearch
+
+import (
+	"context"
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"path/filepath"
+	"testing"
+	"time"
+)
+
+func TestLookupRefusesPIIWithoutFetch(t *testing.T) {
+	hits := 0
+	srv := httptest.NewServer(http.HandlerFunc(func(http.ResponseWriter, *http.Request) {
+		hits++
+	}))
+	defer srv.Close()
+	out := Lookup(context.Background(), "Personalnummer 12", LookupOpt{
+		EnvPath: writeEnv(t, srv.URL),
+		CachePath: filepath.Join(t.TempDir(), "c.sqlite"),
+		Client:    srv.Client(),
+		Sleep:     func(context.Context, time.Duration) error { return nil },
+	})
+	if out.Status != StatusRefused {
+		t.Fatalf("status = %s", out.Status)
+	}
+	if hits != 0 {
+		t.Fatal("PII query left the host")
+	}
+}
+
+func TestLookupSkipsWhenNoConfig(t *testing.T) {
+	out := Lookup(context.Background(), "LadybugDB", LookupOpt{
+		EnvPath:   filepath.Join(t.TempDir(), "missing.env"),
+		CachePath: filepath.Join(t.TempDir(), "c.sqlite"),
+		Sleep:     func(context.Context, time.Duration) error { return nil },
+	})
+	if out.Status != StatusSkipped {
+		t.Fatalf("status = %s", out.Status)
+	}
+}
+
+func TestLookupFetchesOnceAndCaches(t *testing.T) {
+	hits := 0
+	payload := Payload{Query: "x", Results: []RawHit{{Title: "t", URL: "http://example.com", Content: "c", Engine: "bing"}}}
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		hits++
+		json.NewEncoder(w).Encode(payload)
+	}))
+	defer srv.Close()
+	opt := LookupOpt{
+		EnvPath:   writeEnv(t, srv.URL),
+		CachePath: filepath.Join(t.TempDir(), "c.sqlite"),
+		Client:    srv.Client(),
+		Now:       func() float64 { return 1_000 },
+		Sleep:     func(context.Context, time.Duration) error { return nil },
+	}
+	a := Lookup(context.Background(), "LadybugDB", opt)
+	b := Lookup(context.Background(), "LadybugDB", opt)
+	if a.Status != StatusOK || b.Status != StatusOK {
+		t.Fatalf("a=%s b=%s", a.Status, b.Status)
+	}
+	if hits != 1 {
+		t.Fatalf("hits = %d, want 1 (second from cache)", hits)
+	}
+	if !b.Cached {
+		t.Fatal("second lookup not cached")
+	}
+}
+
+func TestLookupEmptyIsThrottled(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Write([]byte(`{"query":"x","results":[]}`))
+	}))
+	defer srv.Close()
+	out := Lookup(context.Background(), "LadybugDB", LookupOpt{
+		EnvPath:   writeEnv(t, srv.URL),
+		CachePath: filepath.Join(t.TempDir(), "c.sqlite"),
+		Client:    srv.Client(),
+		Now:       func() float64 { return 1_000 },
+		Sleep:     func(context.Context, time.Duration) error { return nil },
+	})
+	if out.Status != StatusThrottled {
+		t.Fatalf("status = %s", out.Status)
+	}
+}
+
+func writeEnv(t *testing.T, url string) string {
+	t.Helper()
+	p := filepath.Join(t.TempDir(), "search.env")
+	if err := os.WriteFile(p, []byte("BRAIN_SEARCH_URL="+url+"\n"), 0o600); err != nil {
+		t.Fatal(err)
+	}
+	return p
+}