feat: D16 adjudication — 2v2 stays hypothesis until a rule fires.

temporal_freshness then authority_pairing; unresolved keeps (not confirmed). bin/facts/audit contradict. Gitea #29.
feat: DuckDB quantiles in-process (gcc CGO), not Ladybug. (#34 )
2026-08-14 11:40:16 +01:00 · 2026-08-14 11:32:23 +01:00 · 2026-08-14 11:26:04 +01:00 · 2026-08-14 11:03:39 +01:00 · 2026-08-14 10:57:40 +01:00 · 2026-08-14 10:51:35 +01:00
73 changed files with 2756 additions and 1953 deletions
@@ -45,27 +45,53 @@ jobs:
        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: CGO via Zig (compile brain/search)
+      - name: CGO via Zig (compile brain/search + eval)
        run: |
          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
@@ -12,3 +12,5 @@ __pycache__/
 lib-ladybug/
 go.work.local
 models/
+# Purged from git history. Do not re-add.
+docs/crm-associations-proof.md
@@ -40,15 +40,16 @@ 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/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)
 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)
+internal/     shared Go (brain/rank is cgo-free; facts D16; chats; 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/cgo/      zig zcc zc++ (CGO via zig cc, not gcc)
@@ -65,30 +66,33 @@ 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.go ["self"|"facts"|"info"|"stale"]  # 2-source + staleness gate
+bin/facts/audit.go ["self"|"db"|"contradict"]     # 2-source + D16 adjudication
 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/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
@@ -98,12 +102,16 @@ bin/git/import.go [REPO] [--json] [--limit N]     # go-git history → commit le
 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)

@@ -16,6 +16,10 @@ 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/*

 COPY requirements.lock.txt /tmp/requirements.lock.txt
 RUN python -m pip install --no-cache-dir -r /tmp/requirements.lock.txt \
@@ -4,8 +4,11 @@ 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** — read path + MCP work; v1 goal is [epic #16](https://git.produktor.io/eSlider/2dph/issues/16)
-(milestone [v1 detective brain](https://git.produktor.io/eSlider/2dph/milestone/12)).
+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) in,
+[#29](https://git.produktor.io/eSlider/2dph/issues/29) OQ1 in,
+[#30](https://git.produktor.io/eSlider/2dph/issues/30) OQ3 in.
 Gap: [docs/roadmap.md](docs/roadmap.md).

 ## What
@@ -31,9 +34,9 @@ detective method: **a fact needs ≥2 independent sources or it is
 | 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`, `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. Index/write stays Python (`compose --profile index`) 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. |
@@ -41,12 +44,13 @@ detective method: **a fact needs ≥2 independent sources or it is
 | D13 | portfolio | start graph `(Person:eslider)-[:HAS]->(Portfolio)`, associate other natural/juristic persons later. |
 | 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. |
+| D16 | contradictions | ≥2 yes vs ≥2 no → hypothesis → `(not confirmed)` until a rule fires. Order: **temporal_freshness** (fresh ≥2 vs stale minority), then **authority_pairing** (runtime/config A×B beats narrative C). Store as `a x b vs c x d` on hypothesis leafs. `bin/facts/audit contradict`. [#29](https://git.produktor.io/eSlider/2dph/issues/29). |
 | 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`). |
+| 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

@@ -57,8 +61,10 @@ detective method: **a fact needs ≥2 independent sources or it is
  skills/                   in-project skills (web-search, postgres, brain, picoclaw, diataxis-docs)
  bin/
    facts/extract.go audit.go crm.go  # D14 shebang; Python implementation
-    kb/index                Python write path (called by bin/brain/index.go)
+    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/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
@@ -72,6 +78,7 @@ detective method: **a fact needs ≥2 independent sources or it is
    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               (deprecated shim → web/search.go)
@@ -86,7 +93,9 @@ 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 / FROM_FILE / HAS_VERSION / AUTHORED / ABOUT / ASSOCIATED / SIMILAR_0.85`.
-`FROM_FILE` / `HAS_VERSION` exist in schema; search `--hop` does not walk them yet ([#17](https://git.produktor.io/eSlider/2dph/issues/17)).
+`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`.
@@ -104,17 +113,20 @@ 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). **v2**; does not block epic #16.
- OQ2: OCR — poppler `pdftotext` fast-path exists; scans still docling.
-  [#6](https://git.produktor.io/eSlider/2dph/issues/6) (v2, does not block #16).
- OQ3: optional duckdb-md layer for `SELECT … FORMAT MARKDOWN` export/write-back.
+- OQ1: **in** — D16 adjudication: `temporal_freshness` then `authority_pairing`.
+  Unresolved 2v2 stays hypothesis. [#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.

@@ -123,7 +135,8 @@ 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
@@ -140,8 +153,8 @@ Common props on every node/edge: `root`, `confidence`, `evidence[]`, `how`,
 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; `bin/facts/audit.go` is the D14 wrapper)
-5. `bin/kb/eval` (recall@5 ≥ 0.95). Local SoT is `bin/brain/eval.go` via Zig CGO.
-   CI SoT switch: [#19](https://git.produktor.io/eSlider/2dph/issues/19).
+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
@@ -155,23 +168,22 @@ Feedback loop: every commit → PR → CI → green/gate → merge. Same discipl
 4. .venv: ladybug + model2vec + mistune
 5. schema + tools with TDD (kb + md + facts + brain)
 6. ~/.config/brain config
-7. corpus extraction (facts/info) — **open**: [#18](https://git.produktor.io/eSlider/2dph/issues/18)
+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)

-Read path + MCP are in. The detective brain is not closed until the graph is
-**writable incrementally** and search can **walk** it. Board:
+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) | Write stays Python rebuild; `brain/add` / `POST /ingest` are hints. Ladybug 0.19 WAL corrupts if new leafs land while FTS/HNSW exist. |
-| 2 | [#17](https://git.produktor.io/eSlider/2dph/issues/17) | `--hop` errors. `FROM_FILE` / `HAS_VERSION` are in schema; search does not walk them. |
-| 3 | [#18](https://git.produktor.io/eSlider/2dph/issues/18) | Rebuild is mostly `info` (repo md + mail). `facts/extract` and chats are not a first-class index input. WhatsApp sync is a stub. |
-| 4 | [#15](https://git.produktor.io/eSlider/2dph/issues/15) | Lever = 2dph fact-check. Loop = PicoClaw/MCP `search` → `get` → `audit`. Specify in-repo, not only live config. |
-| 5 | [#19](https://git.produktor.io/eSlider/2dph/issues/19) | GitHub CI recall still runs Python `bin/kb/eval`. |
+| 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: [#6](https://git.produktor.io/eSlider/2dph/issues/6) OCR, OQ1, OQ3, OQ4.
+Does **not** block epic close: OQ4. OCR [#6](https://git.produktor.io/eSlider/2dph/issues/6), OQ1 [#29](https://git.produktor.io/eSlider/2dph/issues/29), OQ3 [#30](https://git.produktor.io/eSlider/2dph/issues/30) are **in**.
@@ -96,7 +96,7 @@ 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):

@@ -120,6 +120,8 @@ 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
 ```
@@ -128,8 +130,9 @@ bin/brain/search.go "invoice from last week"                            # same s

 - **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. Write is
-  Compose profile `index` (`bin/brain/index.go`).
+  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.
@@ -166,6 +169,9 @@ 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
@@ -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:]))
+}
@@ -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

@@ -3,7 +3,7 @@
 //
 // bin/brain/search.go - deduction search over the 2dph brain.
 //
-//	./bin/brain/search.go "query" [--root facts|info] [--repo P] [-n N] [--json] [--no-web]
+//	./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
 //
@@ -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)
@@ -1,14 +1,15 @@
 #!/usr/bin/env python3
 """facts/audit - evidence & lexicon checks for the 2dph brain.

-  bin/facts/audit self      # lexicon: every fact in db has >=2 sources
-  bin/facts/audit db        # evidence gate: run against var/kb.lbug
+  bin/facts/audit self         # lexicon: docs + two-source rule
+  bin/facts/audit db           # evidence gate against var/kb.lbug
+  bin/facts/audit contradict   # D16 adjudication (JSON claim(s) on stdin)

-`self` mode checks the repo itself (no network, no runtime deps). It greps
-for known-good two-source pairings and confirms the docs are consistent.
-`db` mode loads every Leaf with root=facts and asserts each has source_rev
-and a non-empty `loc` (the "where did you see it" evidence pointer) and that
-'confirmed' facts carry a two-source `source` field.
+`self` mode checks the repo itself (no network, no runtime deps).
+`db` mode loads every Leaf with root=facts. Confirmed facts need ` x `;
+hypothesis contradictions need `a x b vs c x d` (both sides ≥2).
+`contradict` applies temporal_freshness then authority_pairing; ≥2 vs ≥2
+with no rule stays hypothesis / `(not confirmed)`.

 Exit 0 = all checks pass, 1 = audit failures, 2 = could not evaluate.
 """
@@ -22,6 +23,8 @@ from pathlib import Path
 ROOT = Path(__file__).resolve().parents[2]
 sys.path.insert(0, str(ROOT / "bin" / "tools"))

+from contradict import adjudicate, check_fact_row  # noqa: E402
+

 def audit_db() -> list[str]:
    from kblib import connect
@@ -33,14 +36,8 @@ def audit_db() -> list[str]:
    r = conn.execute("MATCH (l:Leaf {root:'facts'}) RETURN l.id, l.source, l.loc, l.how, l.confidence")
    problems: list[str] = []
    for lid, source, loc, how, conf in r.get_all():
-        if conf != "confirmed":
-            problems.append(f"{lid}: facts require confidence='confirmed', got '{conf}'")
-        if not source or " x " not in source:
-            problems.append(f"{lid}: needs 2-source evidence in source, got '{source}'")
-        if not loc:
-            problems.append(f"{lid}: missing loc (evidence pointer)")
-        if not how:
-            problems.append(f"{lid}: missing how")
+        problems.extend(check_fact_row(str(lid), str(source or ""), str(loc or ""),
+                                       str(how or ""), str(conf or "")))
    conn.close()
    db.close()
    return problems
@@ -54,20 +51,50 @@ def audit_self() -> list[str]:
        problems.append("PLAN.md missing recall@5 gate")
    if re.search(r"(?i)facts must have.*2 sources|2.source", plan) is None:
        problems.append("PLAN.md missing the two-source evidence rule for facts")
+    if "temporal_freshness" not in plan or "authority_pairing" not in plan:
+        problems.append("PLAN.md missing D16 adjudication rules")
    if re.search(r"(?i)HNSW|BM25|deduction", (ROOT / "README.md").read_text()) is None:
        problems.append("README.md missing search/retrieval description")
    return problems


+def audit_contradict(raw: str) -> tuple[list[str], list[dict]]:
+    raw = raw.strip()
+    if not raw:
+        return ["contradict: empty stdin (JSON claim or {claims:[...]})"], []
+    try:
+        payload = json.loads(raw)
+    except json.JSONDecodeError as e:
+        return [f"contradict: invalid JSON: {e}"], []
+    if isinstance(payload, dict) and "claims" in payload:
+        claims = list(payload.get("claims") or [])
+    elif isinstance(payload, dict):
+        claims = [payload]
+    elif isinstance(payload, list):
+        claims = payload
+    else:
+        return ["contradict: expected object or list"], []
+    details = [adjudicate(c) for c in claims]
+    return [], details
+
+
 def main(argv: list[str]) -> int:
    import argparse
    p = argparse.ArgumentParser(description="evidence & lexicon audit")
-    p.add_argument("mode", choices=("self", "db"))
+    p.add_argument("mode", choices=("self", "db", "contradict"))
    p.add_argument("--json", action="store_true")
    a = p.parse_args(argv)

-    problems = audit_self() if a.mode == "self" else audit_db()
-    out = {"mode": a.mode, "ok": not problems, "problems": problems}
+    details: list[dict] = []
+    if a.mode == "self":
+        problems = audit_self()
+    elif a.mode == "db":
+        problems = audit_db()
+    else:
+        problems, details = audit_contradict(sys.stdin.read())
+    out: dict = {"mode": a.mode, "ok": not problems, "problems": problems}
+    if details:
+        out["contradictions"] = details
    if a.json:
        print(json.dumps(out, indent=2))
    else:
@@ -5,6 +5,7 @@
 //
 //	./bin/facts/audit.go self
 //	./bin/facts/audit.go db
+//	./bin/facts/audit.go contradict --json < claim.json
 //
 // Python bin/facts/audit is the implementation (CI runs it directly).
 // NOTE: never run `gofmt -w` on this file — it breaks the shebang.
@@ -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:]))
@@ -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


@@ -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]
@@ -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
+}
@@ -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
+}
@@ -7,7 +7,7 @@
 //	./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 not in this repo; the tool names match internal/httpapi MCP ops.
+// 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

@@ -17,6 +17,7 @@ import (
 	"os"
 	"strings"

+	"github.com/eSlider/2dph/internal/duckstats"
 	"github.com/eSlider/2dph/internal/reasoner"
 )

@@ -61,6 +62,14 @@ func run(args []string) int {
 	}
 	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)
@@ -76,6 +85,8 @@ func run(args []string) int {
 		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 {
@@ -0,0 +1,103 @@
+"""D16 contradiction adjudication (same rules as internal/facts)."""
+from __future__ import annotations
+
+from typing import Any
+
+CONF_CONFIRMED = "confirmed"
+CONF_HYPOTHESIS = "hypothesis"
+
+RULE_UNRESOLVED = "unresolved"
+RULE_TEMPORAL = "temporal_freshness"
+RULE_AUTHORITY = "authority_pairing"
+RULE_TWO_SOURCE = "two_source"
+RULE_SINGLE = "single_source"
+
+KIND_RUNTIME = "runtime"
+KIND_CONFIG = "config"
+KIND_NARRATIVE = "narrative"
+
+
+def _independent(sources: list[dict]) -> int:
+    seen: set[str] = set()
+    for i, s in enumerate(sources):
+        sid = str(s.get("id") or "") or f"{s.get('kind', '')}#{i}"
+        seen.add(sid)
+    return len(seen)
+
+
+def _fresh_n(sources: list[dict]) -> int:
+    return sum(1 for s in sources if not s.get("stale"))
+
+
+def _strong_n(sources: list[dict]) -> int:
+    return sum(1 for s in sources if s.get("kind") in (KIND_RUNTIME, KIND_CONFIG))
+
+
+def adjudicate(claim: dict[str, Any]) -> dict[str, Any]:
+    yes = list(claim.get("yes") or [])
+    no = list(claim.get("no") or [])
+    yes_n, no_n = _independent(yes), _independent(no)
+    text = str(claim.get("text") or "")
+
+    def out(conf: str, rule: str, winner: str = "") -> dict[str, Any]:
+        return {
+            "text": text,
+            "confidence": conf,
+            "confirmed": conf == CONF_CONFIRMED,
+            "rule": rule,
+            "winner": winner,
+            "yes": yes_n,
+            "no": no_n,
+        }
+
+    if yes_n < 2 or no_n < 2:
+        if yes_n >= 2:
+            return out(CONF_CONFIRMED, RULE_TWO_SOURCE, "yes")
+        if no_n >= 2:
+            return out(CONF_CONFIRMED, RULE_TWO_SOURCE, "no")
+        return out(CONF_HYPOTHESIS, RULE_SINGLE)
+    yf, nf = _fresh_n(yes), _fresh_n(no)
+    if yf >= 2 and nf < 2:
+        return out(CONF_CONFIRMED, RULE_TEMPORAL, "yes")
+    if nf >= 2 and yf < 2:
+        return out(CONF_CONFIRMED, RULE_TEMPORAL, "no")
+    ys, ns = _strong_n(yes), _strong_n(no)
+    if ys >= 2 and ns < 2:
+        return out(CONF_CONFIRMED, RULE_AUTHORITY, "yes")
+    if ns >= 2 and ys < 2:
+        return out(CONF_CONFIRMED, RULE_AUTHORITY, "no")
+    return out(CONF_HYPOTHESIS, RULE_UNRESOLVED)
+
+
+def parse_source_field(source: str) -> tuple[str, str]:
+    """Split `a x b vs c x d` into (yes, no). Empty no if no ` vs `."""
+    if " vs " not in source:
+        return source, ""
+    yes, _, no = source.partition(" vs ")
+    return yes.strip(), no.strip()
+
+
+def check_fact_row(lid: str, source: str, loc: str, how: str, conf: str) -> list[str]:
+    """Lexicon checks for one facts leaf (no Ladybug)."""
+    problems: list[str] = []
+    src = source or ""
+    if conf == CONF_CONFIRMED:
+        if " vs " in src:
+            problems.append(f"{lid}: confirmed fact cannot keep a vs-contradiction")
+        if " x " not in src:
+            problems.append(f"{lid}: needs 2-source evidence in source, got '{source}'")
+    elif conf == CONF_HYPOTHESIS:
+        yes, no = parse_source_field(src)
+        if not no or " x " not in yes or " x " not in no:
+            problems.append(
+                f"{lid}: hypothesis contradiction needs 'a x b vs c x d', got '{source}'"
+            )
+    elif conf == "partial":
+        pass
+    else:
+        problems.append(f"{lid}: unknown confidence '{conf}'")
+    if not loc:
+        problems.append(f"{lid}: missing loc (evidence pointer)")
+    if not how:
+        problems.append(f"{lid}: missing how")
+    return problems
@@ -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()
@@ -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()
@@ -75,9 +75,20 @@ 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()
@@ -116,6 +127,22 @@ class BinLayoutTest(unittest.TestCase):
            self.assertIn("cmdbin.ExecFile", text)
            self.assertIn(f"bin/facts/{method.removesuffix('.go')}", text)

+    def test_d16_adjudication_is_cgo_free(self) -> None:
+        self.assertTrue((ROOT / "internal" / "facts" / "contradict.go").is_file())
+        go = (ROOT / "internal" / "facts" / "contradict.go").read_text()
+        py = (ROOT / "bin" / "tools" / "contradict.py").read_text()
+        audit = (ROOT / "bin" / "facts" / "audit").read_text()
+        for token in ("temporal_freshness", "authority_pairing", "unresolved"):
+            self.assertIn(token, go)
+            self.assertIn(token, py)
+        self.assertIn("contradict", audit)
+        self.assertIn(" vs ", py)
+        plan = (ROOT / "PLAN.md").read_text()
+        self.assertIn("temporal_freshness", plan)
+        self.assertIn("authority_pairing", plan)
+        shebang = (ROOT / "bin" / "facts" / "audit.go").read_text()
+        self.assertIn("contradict", shebang)
+
    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()
@@ -125,6 +152,33 @@ class BinLayoutTest(unittest.TestCase):
            "index_mail must point at bin/brain/index.go",
        )

+    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()
@@ -179,6 +233,32 @@ class BinLayoutTest(unittest.TestCase):
            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
@@ -196,3 +276,25 @@ class BinLayoutTest(unittest.TestCase):
        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")
@@ -0,0 +1,104 @@
+import os
+import sys
+import unittest
+
+sys.path.insert(0, os.path.dirname(__file__))
+
+from contradict import (  # noqa: E402
+    RULE_AUTHORITY,
+    RULE_SINGLE,
+    RULE_TEMPORAL,
+    RULE_TWO_SOURCE,
+    RULE_UNRESOLVED,
+    adjudicate,
+    check_fact_row,
+    parse_source_field,
+)
+
+
+def src(i, kind, stale=False):
+    return {"id": i, "kind": kind, "stale": stale}
+
+
+class TestContradict(unittest.TestCase):
+    def test_two_vs_two_stays_hypothesis(self):
+        r = adjudicate({
+            "text": "svc listens on 443",
+            "yes": [src("docker-ps", "runtime"), src("compose", "config")],
+            "no": [src("docker-old", "runtime"), src("compose-old", "config")],
+        })
+        self.assertFalse(r["confirmed"])
+        self.assertEqual(r["rule"], RULE_UNRESOLVED)
+        self.assertEqual(r["winner"], "")
+
+    def test_temporal_freshness(self):
+        r = adjudicate({
+            "text": "svc listens on 443",
+            "yes": [src("docker-ps", "runtime"), src("compose", "config")],
+            "no": [src("old-readme", "narrative", True), src("old-wiki", "narrative", True)],
+        })
+        self.assertTrue(r["confirmed"])
+        self.assertEqual(r["rule"], RULE_TEMPORAL)
+        self.assertEqual(r["winner"], "yes")
+
+    def test_authority_pairing(self):
+        r = adjudicate({
+            "text": "svc listens on 443",
+            "yes": [src("docker-ps", "runtime"), src("compose", "config")],
+            "no": [src("readme", "narrative"), src("wiki", "narrative")],
+        })
+        self.assertTrue(r["confirmed"])
+        self.assertEqual(r["rule"], RULE_AUTHORITY)
+        self.assertEqual(r["winner"], "yes")
+
+    def test_two_source_and_single(self):
+        two = adjudicate({
+            "text": "arc-1 runs Matrix",
+            "yes": [src("compose", "config"), src("docker-ps", "runtime")],
+        })
+        self.assertTrue(two["confirmed"])
+        self.assertEqual(two["rule"], RULE_TWO_SOURCE)
+        one = adjudicate({"text": "maybe", "yes": [src("readme", "narrative")]})
+        self.assertFalse(one["confirmed"])
+        self.assertEqual(one["rule"], RULE_SINGLE)
+
+    def test_parse_source_field(self):
+        yes, no = parse_source_field("docker ps x compose.yml vs old.md x wiki.md")
+        self.assertIn(" x ", yes)
+        self.assertIn(" x ", no)
+
+    def test_check_fact_row_allows_hypothesis_vs(self):
+        p = check_fact_row(
+            "L1", "a.md x b.md vs c.md x d.md", "var/", "audit", "hypothesis",
+        )
+        self.assertEqual(p, [])
+        p = check_fact_row("L2", "a.md x b.md", "var/", "audit", "confirmed")
+        self.assertEqual(p, [])
+        p = check_fact_row("L3", "a.md x b.md vs c.md x d.md", "var/", "audit", "confirmed")
+        self.assertTrue(any("vs-contradiction" in x for x in p))
+        p = check_fact_row("L4", "only-one.md", "var/", "audit", "hypothesis")
+        self.assertTrue(any("a x b vs" in x for x in p))
+
+    def test_audit_contradict_cli_unresolved(self):
+        import json
+        import subprocess
+        from pathlib import Path
+        root = Path(__file__).resolve().parents[2]
+        payload = json.dumps({
+            "text": "svc 443",
+            "yes": [src("a", "runtime"), src("b", "config")],
+            "no": [src("c", "runtime"), src("d", "config")],
+        })
+        proc = subprocess.run(
+            [sys.executable, str(root / "bin" / "facts" / "audit"), "contradict", "--json"],
+            input=payload, capture_output=True, text=True, check=False,
+        )
+        self.assertEqual(proc.returncode, 0, proc.stderr)
+        out = json.loads(proc.stdout)
+        self.assertTrue(out["ok"])
+        self.assertEqual(out["contradictions"][0]["rule"], RULE_UNRESOLVED)
+        self.assertFalse(out["contradictions"][0]["confirmed"])
+
+
+if __name__ == "__main__":
+    unittest.main()
@@ -39,3 +39,59 @@ class IndexAdapterTest(unittest.TestCase):
        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()
@@ -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()
@@ -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()
@@ -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:
@@ -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

@@ -122,7 +121,7 @@ class PublishedDocsTest(unittest.TestCase):
        self.assertIn("D18", plan)
        self.assertIn("Qwen/Qwen3.5-9B", plan)
        compose = (ROOT / "compose.yaml").read_text()
-        self.assertIn('profiles: ["reasoner"]', compose)
+        self.assertIn('"reasoner"', compose)
        self.assertIn("OLLAMA_NUM_GPU", compose)
        self.assertIn("127.0.0.1:11435", compose)
        dockerfile = (ROOT / "Dockerfile").read_text()
@@ -139,24 +138,21 @@ class PublishedDocsTest(unittest.TestCase):
        skill = (ROOT / "skills" / "brain" / "SKILL.md").read_text()
        self.assertIn("`web` block", skill)

-    def test_docs_do_not_claim_hop_walks(self) -> None:
+    def test_docs_say_hop_walks_from_file(self) -> None:
        paths = [
            ROOT / "README.md",
            ROOT / "docs" / "design.md",
            ROOT / "skills" / "brain" / "SKILL.md",
-            ROOT / "skills" / "diataxis-docs" / "SKILL.md",
            ROOT / "docs" / "runbook.md",
            ROOT / "docs" / "README.md",
-            ROOT / "docs" / "roadmap.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:
@@ -47,3 +47,17 @@ class SkillsTest(unittest.TestCase):
        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)
@@ -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}")
@@ -2,14 +2,23 @@
 #
 #   docker compose up -d brain                  # API (Zig CGO serve)
 #   docker compose --profile index run --rm index   # Python rebuild
-#   docker compose --profile picoclaw up brain-mcp
+#   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
 #
 # 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:api
@@ -97,8 +106,8 @@ services:
      - ./deploy/searxng/limiter.toml:/etc/searxng/limiter.toml:ro
    restart: unless-stopped

-  # MCP endpoint for an external agent (PicoClaw is not shipped here).
-  #   docker compose --profile picoclaw up brain-mcp
+  # MCP endpoint for PicoClaw (and any MCP client).
+  #   docker compose --profile picoclaw up -d
  brain-mcp:
    profiles: ["picoclaw"]
    image: ghcr.io/eslider/2dph:api
@@ -120,7 +129,7 @@ services:
  #   docker compose --profile reasoner up -d reasoner
  #   docker compose --profile reasoner exec reasoner ollama pull qwen3.5:9b
  reasoner:
-    profiles: ["reasoner"]
+    profiles: ["reasoner", "picoclaw"]
    image: docker.io/ollama/ollama:latest
    environment:
      OLLAMA_NUM_GPU: "0"
@@ -131,7 +140,37 @@ services:
      - 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:
  reasoner-ollama:
+  picoclaw-home:
@@ -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"
+        }
+      }
+    }
+  }
+}
@@ -20,16 +20,16 @@ Evidence-first knowledge graph. Facts need proof or they are
 | 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–D21 |
+| reference | [PLAN.md](../PLAN.md) — decisions D1–D22 |

 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.

 Search: `bin/brain/search.go "query"` (HTTP: `bin/brain/serve.go` —
-`/health` `/search` `/get` `/stats` `/audit` `/ingest`). `--hop` is
-not a walk; the flag errors. Schema has `FROM_FILE`; search does not
-use it ([#17](https://git.produktor.io/eSlider/2dph/issues/17)).
+`/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)).
@@ -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.
@@ -34,9 +34,9 @@ bin/brain/search.go "question"
     is not evidence of absence; `--no-web` / `--root` skip it)
 ```

-`--hop` is not implemented. `FROM_FILE` / `HAS_VERSION` exist in schema;
-search does not walk them ([#17](https://git.produktor.io/eSlider/2dph/issues/17)).
-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

@@ -71,7 +71,9 @@ 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) stay hypothesis until
+`temporal_freshness` or `authority_pairing` fires (`bin/facts/audit contradict`,
+[#29](https://git.produktor.io/eSlider/2dph/issues/29)).

 ## Read path

@@ -80,14 +82,16 @@ Conflicting pairings (≥2 yes vs ≥2 no) = hypothesis (OQ1 → v2 resolution).
 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`). Index/write is still `bin/kb/index`
+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`.
+`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)
@@ -98,5 +102,5 @@ 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 (write, hops, corpus, agent loop): [roadmap](roadmap.md),
+Gap to v1 (hops, corpus, CI eval): [roadmap](roadmap.md),
 [epic #16](https://git.produktor.io/eSlider/2dph/issues/16).
@@ -1,18 +1,34 @@
 # PicoClaw profile (reference agent)

-2dph is the memory/fact gate. PicoClaw (or any MCP client) is the agent loop
-and is **not** shipped in this repo.
+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 brain-mcp
+docker compose --profile picoclaw up -d
+# already serving :8630 / :11435:
+docker compose --profile picoclaw up -d --no-deps picoclaw
 ```

-The API listens on `127.0.0.1:8630`. Point the agent at
-`http://127.0.0.1:8630/mcp` using [deploy/picoclaw/mcp.json.example](../deploy/picoclaw/mcp.json.example).
+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`.

-No Cursor required. A live PicoClaw binary/image is an operator choice.
+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).
@@ -1,8 +1,8 @@
 # Reasoner bake-off (D18)

 Pluggable OpenAI-compatible URL. 2dph does not ship weights. PicoClaw is
-not in this repo; the bake-off hits the same tool names PicoClaw would
-(`search` → `get` → `audit` from `internal/httpapi.Ops`).
+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
@@ -11,6 +11,8 @@ 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.

@@ -23,45 +23,44 @@ Decisions: [PLAN.md](../PLAN.md).
 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.

-`POST /ingest` is a rebuild **hint**. `add` is not implemented.
+## 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 — **in** (`temporal_freshness`, `authority_pairing`).

 ## Blockers

+None for epic #16 (closed). Remaining v2: OQ4.
+
 ```
 question
    │
    ├─ FTS + HNSW          ← in
    ├─ facts / info roots  ← in
    ├─ web (D17)           ← in
-    ├─ Cypher hop          ← #17  schema yes, search no
-    ├─ brain/add ACID      ← #14  rebuild only
-    └─ facts+chats corpus  ← #18
+    ├─ brain/add ACID      ← in
+    ├─ Cypher hop          ← in
+    └─ facts+chats corpus  ← in
 ```

-1. **[#14](https://git.produktor.io/eSlider/2dph/issues/14) write** —
-   `bin/brain/index.go --rebuild` (Python `kblib`). No incremental
-   `brain/add`. Watch/mail/git cannot become facts “now”.
-2. **[#17](https://git.produktor.io/eSlider/2dph/issues/17) hops** —
-   `Leaf-[:FROM_FILE]->File-[:HAS_VERSION]->Commit-[:AUTHORED]->Person`
-   exists; `--hop` still errors. Without a walk, D9/D10 are paper.
-3. **[#18](https://git.produktor.io/eSlider/2dph/issues/18) corpus** —
-   rebuild loads repo markdown + mail as `info`. `facts/extract` pairing
-   and `bin/chats` are not indexed. WhatsApp is a stub. PII stays in `var/`.
-4. **[#15](https://git.produktor.io/eSlider/2dph/issues/15) lever/loop** —
-   2dph is the lever (`search` → `get` → `audit`). PicoClaw is the loop.
-   Document the contour in-repo; CPU turns need a large context window.
-5. **[#19](https://git.produktor.io/eSlider/2dph/issues/19) CI eval** —
-   recall SoT should be `bin/brain/eval.go` via Zig, not Python `bin/kb/eval`.
-
 ## Not v1

-[#6](https://git.produktor.io/eSlider/2dph/issues/6) OCR (OQ2), OQ1
-contradiction resolution, OQ3 duckdb-md export, OQ4 YAML-first leafs.
+OQ4 YAML-first leafs.
+OCR (OQ2), duckdb-go (OQ3/D22), and D16 adjudication (OQ1) are in.

 ## Close epic #16 when

- facts+info can be written without a full rebuild for every leaf
- `--hop` stops erroring and runs a Cypher path from search hits
- ops pairing + chat import land as leafs on rebuild
- MCP tool order is documented and still gated by tests
+Children #14, #15, #17, #18, #19 are closed. MCP tool order stays gated by tests.
@@ -16,6 +16,7 @@ No laptop-absolute paths. Config lives in env files under `$HOME/.config/brain/`
 - 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
@@ -43,18 +44,20 @@ That binds `127.0.0.1:8888`. JSON format must stay enabled.

 ## Index then search

-Write path is Compose profile `index` (Python Ladybug rebuild) until
-`brain/add` is v2. The operator command is `bin/brain/index.go`.
+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/index.go --rebuild
+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` is not implemented. Empty web results are `throttled`, not absence.
+`--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 =
@@ -7,6 +7,7 @@ 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
@@ -20,10 +21,17 @@ require (
 	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
@@ -31,6 +31,20 @@ github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSs
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc h1:U9qPSI2PIWSS1VwoXQT9A3Wy9MM3WgvqSxFWenqJduM=
 github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/duckdb/duckdb-go-bindings v0.10505.0 h1:/0pPsTLrcCsTGxT0VrHgJWnOcPe1tQL1vrki1v3jbAI=
+github.com/duckdb/duckdb-go-bindings v0.10505.0/go.mod h1:HoD5xePkDj3VZbBnVVfxVVYIljZ9khCprWA7FgwIiC4=
+github.com/duckdb/duckdb-go-bindings/lib/darwin-amd64 v0.10505.0 h1:FrMqquFBQlMsi34h2KZgCku54rqA8xEbXZ0NLVDKwYs=
+github.com/duckdb/duckdb-go-bindings/lib/darwin-amd64 v0.10505.0/go.mod h1:EnAvZh1kNJHp5yF+M1ZHNEvapnmt6anq1xXHVrAGqMo=
+github.com/duckdb/duckdb-go-bindings/lib/darwin-arm64 v0.10505.0 h1:lbRbpQwT1MmUhh/VTwukV9K8bxKByV3UghAP3MvsbBo=
+github.com/duckdb/duckdb-go-bindings/lib/darwin-arm64 v0.10505.0/go.mod h1:IGLSeEcFhNeZF16aVjQCULD7TsFZKG5G7SyKJAXKp5c=
+github.com/duckdb/duckdb-go-bindings/lib/linux-amd64 v0.10505.0 h1:nrsaVYj3XYCRbS2FpdOMD/KHE7egRMr+/NR1IHmjT84=
+github.com/duckdb/duckdb-go-bindings/lib/linux-amd64 v0.10505.0/go.mod h1:KAIynZ0GHCS7X5fRyuFnQMg/SZBPK/bS9OCOVojClxw=
+github.com/duckdb/duckdb-go-bindings/lib/linux-arm64 v0.10505.0 h1:qM6oGDgwXBILJGbTY4fCy6QOczLpucUA6yn6g3ORjh4=
+github.com/duckdb/duckdb-go-bindings/lib/linux-arm64 v0.10505.0/go.mod h1:81SGOYoEUs8qaAfSk1wRfM5oobrIJ5KI7AzYhK6/bvQ=
+github.com/duckdb/duckdb-go-bindings/lib/windows-amd64 v0.10505.0 h1:DjqZl9rYreHkSOqnqLmkrqH5T8UdQNcxZLJVZzGmXXA=
+github.com/duckdb/duckdb-go-bindings/lib/windows-amd64 v0.10505.0/go.mod h1:K25pJL26ARblGDeuAkrdblFvUen92+CwksLtPEHRqqQ=
+github.com/duckdb/duckdb-go/v2 v2.10505.0 h1:SWwvLn2Qx/RQSnQNupwgIF8VbnJ5A6OQU9lYb/mDETI=
+github.com/duckdb/duckdb-go/v2 v2.10505.0/go.mod h1:m0PW4J4FG9hlFlVdXi6Ds9owpyIDaBdE2jyce00fGcE=
 github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkpeCY=
 github.com/dustin/go-humanize v1.0.1/go.mod h1:Mu1zIs6XwVuF/gI1OepvI0qD18qycQx+mFykh5fBlto=
 github.com/elazarl/goproxy v1.7.2 h1:Y2o6urb7Eule09PjlhQRGNsqRfPmYI3KKQLFpCAV3+o=
@@ -47,6 +61,8 @@ github.com/go-git/go-git-fixtures/v4 v4.3.2-0.20231010084843-55a94097c399 h1:eMj
 github.com/go-git/go-git-fixtures/v4 v4.3.2-0.20231010084843-55a94097c399/go.mod h1:1OCfN199q1Jm3HZlxleg+Dw/mwps2Wbk9frAWm+4FII=
 github.com/go-git/go-git/v5 v5.19.2 h1:wkfn7vOlUBu8ivAWKBWisTiwJK4jYHzTF8Ndv1LyGqY=
 github.com/go-git/go-git/v5 v5.19.2/go.mod h1:QqCBE1EFN5ddFmrliLQ3/ntRCUjZU3EJuwuB/jWEHjk=
+github.com/go-viper/mapstructure/v2 v2.5.0 h1:vM5IJoUAy3d7zRSVtIwQgBj7BiWtMPfmPEgAXnvj1Ro=
+github.com/go-viper/mapstructure/v2 v2.5.0/go.mod h1:oJDH3BJKyqBA2TXFhDsKDGDTlndYOZ6rGS0BRZIxGhM=
 github.com/goccy/go-json v0.10.6 h1:p8HrPJzOakx/mn/bQtjgNjdTcN+/S6FcG2CTtQOrHVU=
 github.com/goccy/go-json v0.10.6/go.mod h1:oq7eo15ShAhp70Anwd5lgX2pLfOS3QCiwU/PULtXL6M=
 github.com/golang/groupcache v0.0.0-20241129210726-2c02b8208cf8 h1:f+oWsMOmNPc8JmEHVZIycC7hBoQxHH9pNKQORJNozsQ=
@@ -7,6 +7,8 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"os/exec"
+	"path/filepath"

 	"github.com/eSlider/2dph/internal/brain/rank"
 )
@@ -137,12 +139,22 @@ func (HTTP) Audit(context.Context) ([]byte, error) {
 	return json.Marshal(map[string]any{"status": "ok", "by_confidence": rows})
 }

-func (HTTP) Ingest(context.Context) ([]byte, error) {
+func (HTTP) Ingest(ctx context.Context, body []byte) ([]byte, error) {
+	if len(bytes.TrimSpace(body)) == 0 {
 		return json.Marshal(map[string]any{
-		"mode":    "rebuild",
-		"command": "bin/brain/index.go --rebuild",
-		"add":     "v2",
+			"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 {
@@ -6,7 +6,7 @@ import (
 	"strings"
 )

-const Usage = `usage: bin/brain/search.go "query" [--root facts|info] [--repo REPO] [-n N] [--json] [--no-web]
+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`

@@ -15,6 +15,7 @@ type Options struct {
 	Root      string
 	Repo      string
 	Limit     int
+	Hop       int
 	JSONOut   bool
 	ListModel bool
 	NoWeb     bool
@@ -22,8 +23,6 @@ type Options struct {

 // 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
@@ -52,7 +51,15 @@ 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":
@@ -19,20 +19,35 @@ type SecondSourceHit struct {

 type WebFn func(query string) SecondSource

-// ShouldEscalate is true when the default deduction path has no facts hit.
+// ShouldEscalate is true when the default deduction path has no confirmed
+// facts hit. Hypothesis/partial facts are `(not confirmed)` (D16).
 // `--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" {
+		if ConfirmedFact(h) {
 			return false
 		}
 	}
 	return true
 }

+// ConfirmedFact is a facts-root hit that is not hypothesis/partial.
+// Empty confidence is treated as confirmed (legacy leafs).
+func ConfirmedFact(h Hit) bool {
+	if h.Root != "facts" {
+		return false
+	}
+	switch h.Confidence {
+	case "hypothesis", "partial":
+		return false
+	default:
+		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) {
@@ -14,6 +14,16 @@ func TestShouldEscalateWhenNoFacts(t *testing.T) {
 	}
 }

+func TestShouldEscalateWhenHypothesisFacts(t *testing.T) {
+	hyp := Hit{ID: "c", Root: "facts", Confidence: "hypothesis", Source: "a x b vs c x d"}
+	if !ShouldEscalate([]Hit{hyp}, "") {
+		t.Fatal("hypothesis facts are (not confirmed); escalate")
+	}
+	if ConfirmedFact(hyp) {
+		t.Fatal("hypothesis is 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, "") {
@@ -3,7 +3,34 @@ package rank
 // BM25 ranks best-first, so the top hits are the *highest* scores; cosine
 // distance ranks best-first ascending. Both mirror kblib.py.
 const FTSStmt = "CALL QUERY_FTS_INDEX('Leaf', 'id', $q) " +
-	"RETURN node.id, node.text, node.root, node.source, score ORDER BY score DESC LIMIT $n"
+	"RETURN node.id, node.text, node.root, node.source, score, node.confidence ORDER BY score DESC LIMIT $n"

 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"
+	"RETURN node.id, node.text, node.root, node.source, distance, node.confidence 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 ""
+	}
+}
@@ -7,14 +7,23 @@ 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"`
+	Confidence string    `json:"confidence,omitempty"`
 	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.
@@ -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")
 	}
 }

@@ -146,4 +172,7 @@ func TestFTSQueryOrdersByScoreDescending(t *testing.T) {
 	if !strings.Contains(FTSStmt, "ORDER BY score DESC") {
 		t.Fatalf("FTS query must order by score DESC, got:\n%s", FTSStmt)
 	}
+	if !strings.Contains(FTSStmt, "node.confidence") {
+		t.Fatal("FTS must return confidence for D16")
+	}
 }
@@ -56,6 +56,12 @@ func runSearch(args []string) int {
 		fmt.Fprintf(os.Stderr, "search: %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
+		}
+	}

 	results := hits
 	for i := range results {
@@ -108,6 +114,44 @@ func searchHits(query, root, repo string, limit int) ([]Hit, error) {
 	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
@@ -168,7 +212,11 @@ func rowsToHits(res *lbug.QueryResult) ([]Hit, error) {
 		root := fmt.Sprint(vals[2])
 		source := fmt.Sprint(vals[3])
 		score := float64(vals[4].(float64))
-		hits = append(hits, Hit{ID: id, Text: text, Root: root, Source: source, Score: score})
+		conf := ""
+		if len(vals) >= 6 {
+			conf = fmt.Sprint(vals[5])
+		}
+		hits = append(hits, Hit{ID: id, Text: text, Root: root, Source: source, Score: score, Confidence: conf})
 	}
 	return hits, nil
 }
@@ -186,8 +234,10 @@ type jsonHit struct {
 	ID         string         `json:"id"`
 	Text       string         `json:"text"`
 	Root       string         `json:"root"`
+	Confidence string         `json:"confidence,omitempty"`
 	Score      float64        `json:"score"`
 	Snippet    string         `json:"snippet,omitempty"`
+	Hops       []rank.HopNode `json:"hops,omitempty"`
 }

 func toJSONOut(hits []Hit, query, rootFilter string, web *rank.SecondSource) *jsonOut {
@@ -197,8 +247,10 @@ func toJSONOut(hits []Hit, query, rootFilter string, web *rank.SecondSource) *js
 			ID:         h.ID,
 			Text:       h.Text,
 			Root:       h.Root,
+			Confidence: h.Confidence,
 			Score:      h.Score,
 			Snippet:    h.Snippet,
+			Hops:       h.Hops,
 		}
 	}
 	return &jsonOut{
@@ -219,9 +271,24 @@ func resultsToDicts(hits []Hit) []any {
 			{"root", h.Root},
 			{"score", h.Score},
 		}
+		if h.Confidence != "" {
+			d = append(d, KV{"confidence", h.Confidence})
+		}
 		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
@@ -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
+}
@@ -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)
+	}
+}
@@ -0,0 +1,120 @@
+// Package facts is cgo-free evidence rules (D16 contradictions).
+package facts
+
+import "strconv"
+
+const (
+	ConfConfirmed  = "confirmed"
+	ConfHypothesis = "hypothesis"
+
+	RuleUnresolved        = "unresolved"
+	RuleTemporalFreshness = "temporal_freshness"
+	RuleAuthorityPairing  = "authority_pairing"
+	RuleTwoSource         = "two_source"
+	RuleSingleSource      = "single_source"
+
+	KindRuntime   = "runtime"
+	KindConfig    = "config"
+	KindNarrative = "narrative"
+)
+
+// Source is one independent pointer on a yes or no side.
+type Source struct {
+	ID    string `json:"id"`
+	Kind  string `json:"kind"`
+	When  string `json:"when,omitempty"`
+	Stale bool   `json:"stale,omitempty"`
+}
+
+// Claim is one assertion with yes/no evidence lists.
+type Claim struct {
+	Text string   `json:"text"`
+	Yes  []Source `json:"yes"`
+	No   []Source `json:"no"`
+}
+
+// Result is audit output. Confirmed=false means `(not confirmed)`.
+type Result struct {
+	Text       string `json:"text"`
+	Confidence string `json:"confidence"`
+	Confirmed  bool   `json:"confirmed"`
+	Rule       string `json:"rule"`
+	Winner     string `json:"winner,omitempty"`
+	YesN       int    `json:"yes"`
+	NoN        int    `json:"no"`
+}
+
+func independent(ss []Source) int {
+	seen := map[string]struct{}{}
+	for i, s := range ss {
+		id := s.ID
+		if id == "" {
+			id = s.Kind + "#" + strconv.Itoa(i)
+		}
+		seen[id] = struct{}{}
+	}
+	return len(seen)
+}
+
+func freshN(ss []Source) int {
+	n := 0
+	for _, s := range ss {
+		if !s.Stale {
+			n++
+		}
+	}
+	return n
+}
+
+func strongN(ss []Source) int {
+	n := 0
+	for _, s := range ss {
+		if s.Kind == KindRuntime || s.Kind == KindConfig {
+			n++
+		}
+	}
+	return n
+}
+
+func out(c Claim, conf, rule, winner string) Result {
+	return Result{
+		Text:       c.Text,
+		Confidence: conf,
+		Confirmed:  conf == ConfConfirmed,
+		Rule:       rule,
+		Winner:     winner,
+		YesN:       independent(c.Yes),
+		NoN:        independent(c.No),
+	}
+}
+
+// Adjudicate applies D16: ≥2 yes vs ≥2 no stays hypothesis until a rule fires.
+// Order: temporal_freshness, then authority_pairing (A/B beats narrative C).
+func Adjudicate(c Claim) Result {
+	yesN := independent(c.Yes)
+	noN := independent(c.No)
+	if yesN < 2 || noN < 2 {
+		if yesN >= 2 {
+			return out(c, ConfConfirmed, RuleTwoSource, "yes")
+		}
+		if noN >= 2 {
+			return out(c, ConfConfirmed, RuleTwoSource, "no")
+		}
+		return out(c, ConfHypothesis, RuleSingleSource, "")
+	}
+	yf, nf := freshN(c.Yes), freshN(c.No)
+	if yf >= 2 && nf < 2 {
+		return out(c, ConfConfirmed, RuleTemporalFreshness, "yes")
+	}
+	if nf >= 2 && yf < 2 {
+		return out(c, ConfConfirmed, RuleTemporalFreshness, "no")
+	}
+	ys, ns := strongN(c.Yes), strongN(c.No)
+	if ys >= 2 && ns < 2 {
+		return out(c, ConfConfirmed, RuleAuthorityPairing, "yes")
+	}
+	if ns >= 2 && ys < 2 {
+		return out(c, ConfConfirmed, RuleAuthorityPairing, "no")
+	}
+	return out(c, ConfHypothesis, RuleUnresolved, "")
+}
@@ -0,0 +1,86 @@
+package facts
+
+import "testing"
+
+func src(id, kind string, stale bool) Source {
+	return Source{ID: id, Kind: kind, Stale: stale}
+}
+
+func TestTwoVsTwoStaysHypothesis(t *testing.T) {
+	c := Claim{
+		Text: "svc listens on 443",
+		Yes: []Source{
+			src("docker-ps", KindRuntime, false),
+			src("compose", KindConfig, false),
+		},
+		No: []Source{
+			src("docker-ps-old", KindRuntime, false),
+			src("compose-old", KindConfig, false),
+		},
+	}
+	r := Adjudicate(c)
+	if r.Confirmed || r.Confidence != ConfHypothesis || r.Rule != RuleUnresolved {
+		t.Fatalf("2v2 must stay (not confirmed): %+v", r)
+	}
+	if r.Winner != "" {
+		t.Fatalf("unresolved must not name a winner: %+v", r)
+	}
+}
+
+func TestTemporalFreshnessResolvesStaleSide(t *testing.T) {
+	c := Claim{
+		Text: "svc listens on 443",
+		Yes: []Source{
+			src("docker-ps", KindRuntime, false),
+			src("compose", KindConfig, false),
+		},
+		No: []Source{
+			src("old-readme", KindNarrative, true),
+			src("old-wiki", KindNarrative, true),
+		},
+	}
+	r := Adjudicate(c)
+	if !r.Confirmed || r.Rule != RuleTemporalFreshness || r.Winner != "yes" {
+		t.Fatalf("fresh yes vs stale no: %+v", r)
+	}
+}
+
+func TestAuthorityPairingBeatsNarrative(t *testing.T) {
+	c := Claim{
+		Text: "svc listens on 443",
+		Yes: []Source{
+			src("docker-ps", KindRuntime, false),
+			src("compose", KindConfig, false),
+		},
+		No: []Source{
+			src("readme", KindNarrative, false),
+			src("wiki", KindNarrative, false),
+		},
+	}
+	r := Adjudicate(c)
+	if !r.Confirmed || r.Rule != RuleAuthorityPairing || r.Winner != "yes" {
+		t.Fatalf("A×B vs C×C: %+v", r)
+	}
+}
+
+func TestTwoSourceYesIsConfirmed(t *testing.T) {
+	c := Claim{
+		Text: "arc-1 runs Matrix",
+		Yes: []Source{
+			src("compose", KindConfig, false),
+			src("docker-ps", KindRuntime, false),
+		},
+	}
+	r := Adjudicate(c)
+	if !r.Confirmed || r.Rule != RuleTwoSource || r.Winner != "yes" {
+		t.Fatalf("%+v", r)
+	}
+}
+
+func TestSingleSourceIsHypothesis(t *testing.T) {
+	c := Claim{Text: "maybe", Yes: []Source{src("readme", KindNarrative, false)}}
+	r := Adjudicate(c)
+	if r.Confirmed || r.Rule != RuleSingleSource {
+		t.Fatalf("%+v", r)
+	}
+}
@@ -144,7 +144,15 @@ func (s *Server) mcpCall(r *http.Request, params json.RawMessage) (any, error) {
 			return nil, fmt.Errorf("cancelled")
 		}
 		defer s.release()
-		body, err = s.api.Ingest(r.Context())
+		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)
 	}
@@ -11,6 +11,7 @@ import (
 	"context"
 	"encoding/json"
 	"errors"
+	"io"
 	"log"
 	"net/http"
 	"os"
@@ -27,7 +28,7 @@ type API interface {
 	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) ([]byte, error)
+	Ingest(ctx context.Context, body []byte) ([]byte, error)
 }

 type Server struct {
@@ -59,7 +60,7 @@ func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	case PathAudit:
 		s.handleJSON(w, r, s.api.Audit)
 	case PathIngest:
-		s.handleJSON(w, r, s.api.Ingest)
+		s.handleIngest(w, r)
 	case PathOpenAPI:
 		s.handleOpenAPI(w, r)
 	case PathMCP:
@@ -116,6 +117,24 @@ func (s *Server) handleJSON(w http.ResponseWriter, r *http.Request, fn func(cont
 	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)
 }
@@ -191,11 +210,30 @@ func (ExecSearcher) Get(context.Context, string, bool) ([]byte, error) {
 }
 func (ExecSearcher) Stats(context.Context) ([]byte, error) { return nil, errUnimplemented }
 func (ExecSearcher) Audit(context.Context) ([]byte, error) { return nil, errUnimplemented }
-func (ExecSearcher) Ingest(context.Context) ([]byte, error) {
+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":    "rebuild",
-		"command": "bin/brain/index.go --rebuild",
+			"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 {
@@ -1,6 +1,7 @@
 package httpapi

 import (
+	"bytes"
 	"context"
 	"encoding/json"
 	"net/http"
@@ -64,8 +65,11 @@ func (f *fakeSearcher) Audit(context.Context) ([]byte, error) {
 	return []byte(`{"status":"ok"}`), nil
 }

-func (f *fakeSearcher) Ingest(context.Context) ([]byte, error) {
-	return []byte(`{"mode":"rebuild","command":"bin/brain/index.go --rebuild"}`), 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 {
@@ -193,6 +197,27 @@ func TestStatsAuditIngest(t *testing.T) {
 	}
 }

+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 {
@@ -47,7 +47,15 @@ var Ops = []Op{
 	},
 	{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: "get", ID: "ingest", Summary: "rebuild hint (write is v2)", 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"},
 }

@@ -38,11 +38,24 @@ func TestMCPToolsMatchOpenAPIPaths(t *testing.T) {
 			t.Fatalf("MCP tool %s has no OpenAPI path %s", tool.Name, path)
 		}
 	}
-	for _, need := range []string{"search", "get", "stats", "audit"} {
+	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) {
@@ -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
+}
@@ -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)
+	}
+}
@@ -113,6 +113,8 @@ type Report struct {
 	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"`
 }

@@ -6,7 +6,6 @@ readme = "README.md"
 requires-python = ">=3.12"
 license = { text = "MIT" }
 dependencies = [
-    "docling>=2.119.0",
    "ladybug==0.19.1",
    "markitdown[docx,epub,html,image-exif,pdf,pptx,xlsx,zip]>=0.1.7",
    "mistune==3.3.4",
@@ -0,0 +1,257 @@
+#!/usr/bin/env python3
+"""System performance test: PicoClaw surface (brain MCP) + optional reasoner.
+
+  BRAIN_URL=http://127.0.0.1:8630 ./qa/system_perf.py --json
+  REASONER_BASE_URL=http://127.0.0.1:11435/v1 REASONER_MODEL=qwen3.5:9b \\
+    ./qa/system_perf.py --reasoner --picoclaw --json
+
+Does not write Ladybug. Search includes web (D17); expect ~10s+ per search.
+Exit 1 if health/get/audit gates fail. Reasoner is measured, not gated.
+"""
+from __future__ import annotations
+
+import argparse
+import json
+import os
+import statistics
+import sys
+import time
+import urllib.error
+import urllib.request
+from concurrent.futures import ThreadPoolExecutor
+
+DEFAULT_BRAIN = "http://127.0.0.1:8630"
+DEFAULT_REASONER = "http://127.0.0.1:11435/v1"
+DEFAULT_MODEL = "qwen3.5:9b"
+DEFAULT_PICOCLAW = "http://127.0.0.1:18790"
+
+GATE_HEALTH_MS = 500
+GATE_GET_P50_MS = 50
+GATE_AUDIT_P50_MS = 50
+
+
+def _req(url: str, data: bytes | None = None, timeout: float = 90) -> bytes:
+    headers = {"Content-Type": "application/json"} if data is not None else {}
+    req = urllib.request.Request(url, data=data, headers=headers)
+    with urllib.request.urlopen(req, timeout=timeout) as res:
+        return res.read()
+
+
+def timed(fn):
+    t0 = time.perf_counter()
+    out = fn()
+    return (time.perf_counter() - t0) * 1000.0, out
+
+
+def stats(samples: list[float]) -> dict:
+    s = sorted(samples)
+    n = len(s)
+    return {
+        "n": n,
+        "min_ms": round(s[0], 1),
+        "p50_ms": round(s[n // 2], 1),
+        "p95_ms": round(s[min(n - 1, int(n * 0.95))], 1),
+        "max_ms": round(s[-1], 1),
+        "avg_ms": round(statistics.mean(s), 1),
+    }
+
+
+def mcp(brain: str, method: str, params=None, timeout: float = 90) -> dict:
+    payload: dict = {"jsonrpc": "2.0", "id": 1, "method": method}
+    if params is not None:
+        payload["params"] = params
+    raw = _req(brain.rstrip("/") + "/mcp", json.dumps(payload).encode(), timeout=timeout)
+    return json.loads(raw.decode())
+
+
+def mcp_call(brain: str, name: str, arguments: dict, timeout: float = 90) -> tuple[bool, str]:
+    d = mcp(brain, "tools/call", {"name": name, "arguments": arguments}, timeout=timeout)
+    res = d.get("result") or {}
+    text = ((res.get("content") or [{}])[0].get("text") or "")
+    return (not res.get("isError")), text
+
+
+def reasoner_tool_call(base: str, model: str, user: str) -> str:
+    payload = {
+        "model": model,
+        "messages": [
+            {"role": "system", "content": "You are PicoClaw. Always call search before answering."},
+            {"role": "user", "content": user},
+        ],
+        "tools": [
+            {
+                "type": "function",
+                "function": {
+                    "name": "search",
+                    "description": "deduction search",
+                    "parameters": {
+                        "type": "object",
+                        "properties": {"q": {"type": "string"}},
+                        "required": ["q"],
+                    },
+                },
+            }
+        ],
+        "tool_choice": "required",
+    }
+    raw = _req(
+        base.rstrip("/") + "/chat/completions",
+        json.dumps(payload).encode(),
+        timeout=600,
+    )
+    chat = json.loads(raw.decode())
+    tcs = chat["choices"][0]["message"].get("tool_calls") or []
+    if not tcs:
+        return ""
+    return tcs[0]["function"]["name"]
+
+
+def run(args: argparse.Namespace) -> dict:
+    brain = args.brain.rstrip("/")
+    report: dict = {
+        "brain": brain,
+        "device": "cpu",
+        "ok": True,
+        "gates": {},
+        "mcp": {},
+    }
+    ms, _ = timed(lambda: _req(brain + "/health", timeout=5))
+    report["mcp"]["health"] = {"n": 1, "avg_ms": round(ms, 1)}
+    report["gates"]["health"] = ms <= GATE_HEALTH_MS
+    if ms > GATE_HEALTH_MS:
+        report["ok"] = False
+
+    list_ms = []
+    for _ in range(args.n):
+        ms, d = timed(lambda: mcp(brain, "tools/list", timeout=10))
+        names = [t["name"] for t in ((d.get("result") or {}).get("tools") or [])]
+        if "search" not in names:
+            report["ok"] = False
+        list_ms.append(ms)
+    report["mcp"]["tools_list"] = stats(list_ms)
+
+    audit_ms = []
+    for _ in range(args.n):
+        ms, (ok, _) = timed(lambda: mcp_call(brain, "audit", {}))
+        if not ok:
+            report["ok"] = False
+        audit_ms.append(ms)
+    report["mcp"]["audit"] = stats(audit_ms)
+    report["gates"]["audit_p50"] = report["mcp"]["audit"]["p50_ms"] <= GATE_AUDIT_P50_MS
+    if not report["gates"]["audit_p50"]:
+        report["ok"] = False
+
+    ok, text = mcp_call(brain, "search", {"q": "LadybugDB", "n": 2}, timeout=90)
+    inner = json.loads(text) if ok else {}
+    hits = inner.get("results") or []
+    leaf_id = hits[0]["id"] if hits else ""
+    report["mcp"]["search_seed"] = {
+        "ok": ok,
+        "count": inner.get("count"),
+        "web": (inner.get("web") or {}).get("status"),
+    }
+
+    get_ms = []
+    if leaf_id:
+        for _ in range(args.n):
+            ms, (ok, _) = timed(lambda: mcp_call(brain, "get", {"id": leaf_id, "body": True}))
+            if not ok:
+                report["ok"] = False
+            get_ms.append(ms)
+        report["mcp"]["get"] = stats(get_ms)
+        report["gates"]["get_p50"] = report["mcp"]["get"]["p50_ms"] <= GATE_GET_P50_MS
+        if not report["gates"]["get_p50"]:
+            report["ok"] = False
+
+        def one_get() -> float:
+            t0 = time.perf_counter()
+            mcp_call(brain, "get", {"id": leaf_id, "body": True})
+            return (time.perf_counter() - t0) * 1000.0
+
+        t0 = time.perf_counter()
+        with ThreadPoolExecutor(max_workers=8) as ex:
+            conc = list(ex.map(lambda _: one_get(), range(8)))
+        wall = (time.perf_counter() - t0) * 1000.0
+        report["mcp"]["get_concurrent_8"] = {**stats(conc), "wall_ms": round(wall, 1)}
+
+    search_ms = []
+    for q in ("LadybugDB", "model2vec"):
+        ms, (ok, text) = timed(lambda q=q: mcp_call(brain, "search", {"q": q, "n": 3}, timeout=90))
+        inner = json.loads(text) if ok else {}
+        search_ms.append(ms)
+        report.setdefault("mcp", {}).setdefault("search_samples", []).append(
+            {
+                "q": q,
+                "ms": round(ms, 1),
+                "ok": ok,
+                "count": inner.get("count"),
+                "web": (inner.get("web") or {}).get("status"),
+            }
+        )
+    if search_ms:
+        report["mcp"]["search"] = stats(search_ms)
+
+    if args.reasoner:
+        base = args.reasoner_url
+        model = args.model
+        report["reasoner"] = {"base_url": base, "model": model, "calls": []}
+        for user in (
+            "Use tools. Search the 2dph brain for LadybugDB. Call search.",
+            "Use tools. Search the 2dph brain for model2vec. Call search.",
+        ):
+            ms, name = timed(lambda user=user: reasoner_tool_call(base, model, user))
+            report["reasoner"]["calls"].append({"ms": round(ms, 1), "tool": name})
+        tools = [c["tool"] for c in report["reasoner"]["calls"]]
+        report["gates"]["reasoner_tool_call"] = bool(tools) and all(t == "search" for t in tools)
+        if not report["gates"]["reasoner_tool_call"]:
+            report["ok"] = False
+
+    if args.picoclaw:
+        gw = args.picoclaw_url.rstrip("/")
+        ms, raw = timed(lambda: _req(gw + "/health", timeout=5))
+        body = json.loads(raw.decode())
+        report["picoclaw"] = {
+            "url": gw,
+            "health_ms": round(ms, 1),
+            "status": body.get("status"),
+        }
+        report["gates"]["picoclaw_health"] = body.get("status") == "ok" and ms <= GATE_HEALTH_MS
+        if not report["gates"]["picoclaw_health"]:
+            report["ok"] = False
+    return report
+
+
+def main(argv: list[str]) -> int:
+    p = argparse.ArgumentParser(description="2dph system performance (MCP + optional reasoner)")
+    p.add_argument("--brain", default=os.environ.get("BRAIN_URL", DEFAULT_BRAIN))
+    p.add_argument("--n", type=int, default=20)
+    p.add_argument("--json", action="store_true")
+    p.add_argument("--reasoner", action="store_true")
+    p.add_argument("--picoclaw", action="store_true")
+    p.add_argument("--picoclaw-url", default=os.environ.get("PICOCLAW_URL", DEFAULT_PICOCLAW))
+    p.add_argument("--reasoner-url", default=os.environ.get("REASONER_BASE_URL", DEFAULT_REASONER))
+    p.add_argument("--model", default=os.environ.get("REASONER_MODEL", DEFAULT_MODEL))
+    args = p.parse_args(argv)
+    try:
+        report = run(args)
+    except (urllib.error.URLError, TimeoutError, OSError) as e:
+        print(f"system_perf: {e}", file=sys.stderr)
+        return 1
+    if args.json:
+        print(json.dumps(report, indent=2))
+    else:
+        print(f"ok={report['ok']} brain={report['brain']}")
+        for name, block in report.get("mcp", {}).items():
+            if isinstance(block, dict) and "p50_ms" in block:
+                print(f"  {name}: p50={block['p50_ms']} p95={block['p95_ms']} n={block['n']}")
+            elif name == "health":
+                print(f"  health: {block.get('avg_ms')} ms")
+        for k, v in report.get("gates", {}).items():
+            print(f"  gate {k}: {v}")
+        for c in (report.get("reasoner") or {}).get("calls") or []:
+            print(f"  reasoner {c['tool']}: {c['ms']} ms")
+    return 0 if report["ok"] else 1
+
+
+if __name__ == "__main__":
+    raise SystemExit(main(sys.argv[1:]))
@@ -26,14 +26,14 @@ second independent source when local roots cannot confirm. An answer is
 bin/brain/search.go "Matrix federation"                # pointers + snippets, YAML
 bin/brain/search.go "onlyoffice postgres" --root facts # restrict to confirmed
 bin/brain/search.go "where is cs-lexicon" --json | yq '.[].ref'
+bin/brain/add.go --text T --root facts --source "a.md x b.md"
 bin/brain/get.go <id> --body                           # full chunk only when needed
 bin/brain/stats.go                                     # index health
 bin/brain/eval.go                                      # recall@5 >= 0.95 gate (Go; Python bin/kb/eval is CI fallback)
 ```

-`bin/kb/search` is a deprecated wrapper. `--hop` errors (schema has
-`FROM_FILE`; search does not walk it yet, [#17](https://git.produktor.io/eSlider/2dph/issues/17));
-do not treat it as a graph walk.
+`bin/kb/search` is a deprecated wrapper. `--hop N` walks
+`FROM_FILE` / `HAS_VERSION` / `AUTHORED` from each hit (1=File, 3=Person).

 ## Rules

@@ -45,6 +45,8 @@ do not treat it as a graph walk.
  are not evidence of absence. `--root facts|info` and `--no-web` skip the web.
 - If recall looks wrong, run `bin/brain/eval.go`; it gates control questions and
  should stay at or above 95% recall@5.
+- Contradictions (≥2 yes vs ≥2 no) stay `(not confirmed)` until
+  `bin/facts/audit contradict` fires `temporal_freshness` or `authority_pairing`.
 - Agents: `GET /openapi.json` and `POST /mcp` on `bin/brain/serve.go` (same
  handlers; tool names match paths `search`/`get`/`stats`/`audit`). Generated
  list: [tools.md](tools.md).
@@ -8,4 +8,4 @@ Serve: `bin/brain/serve.go` (`GET /openapi.json`, `POST /mcp`).
 - `get` — read one leaf by id
 - `stats` — index health
 - `audit` — facts confidence histogram
- `ingest` — rebuild hint (write is v2)
+- `ingest` — add a leaf without rebuild
@@ -0,0 +1,38 @@
+---
+name: duckdb
+description: >-
+  Use https://github.com/duckdb/duckdb-go in-process for columnar analytics
+  (quantiles, GROUP BY, JSON/CSV/Parquet/JSONL scans) when that is faster than
+  nested Go loops. Not Ladybug. Not the web-search sqlite cache. Use when
+  aggregating samples, counting JSONL, or SQL over tabular files.
+---
+
+# duckdb-go
+
+Use https://github.com/duckdb/duckdb-go where it makes sense to get better performance in code.
+
+In-process DuckDB (`internal/duckstats`, `database/sql` driver `duckdb`).
+Vectorized SQL over tables, JSONL, CSV, Parquet. CGO with bundled libs
+(linux/darwin amd64/arm64). Links with **gcc/g++** (libstdc++), not Zig.
+D21 Zig (`bin/cgo/zcc`) is Ladybug/tokenizers only. After
+`eval "$(bin/cgo/zig env)"`:
+
+```bash
+CC=gcc CXX=g++ CGO_CFLAGS= CGO_LDFLAGS= ./bin/qa/stats.go <<< '[1,2,3,4,5]'
+CC=gcc CXX=g++ CGO_CFLAGS= CGO_LDFLAGS= go test ./internal/duckstats
+```
+
+| Store | Job |
+|-------|-----|
+| Ladybug | graph + FTS + HNSW (facts/info) |
+| modernc sqlite | web-search KV cache + throttle |
+| duckdb-go | OLAP: quantiles, counts, scans of many rows/files |
+| mikefarah/yq | small YAML/JSON/XML/CSV/TOML/HCL slice, not bulk |
+
+```bash
+./bin/qa/stats.go <<< '[1,2,3,4,5]'
+./bin/qa/stats.go --jsonl path/to/rows.jsonl
+```
+
+Do not open Ladybug through DuckDB. Do not put secrets or client PII into
+DuckDB files under the repo.
@@ -1,15 +1,15 @@
 ---
 name: picoclaw
 description: >-
-  2dph is the memory/fact gate, not the agent loop. Use when wiring PicoClaw
-  or any MCP client: call brain search/get/audit before a factual reply.
-  throttled is not a negative finding.
+  2dph is the memory/fact gate. Compose runs the official PicoClaw gateway.
+  Use when wiring PicoClaw or any MCP client: call brain search/get/audit
+  before a factual reply. throttled is not a negative finding.
 ---

 # PicoClaw — fact-check before assert

-PicoClaw (or any agent) speaks MCP at `POST /mcp` on `bin/brain/serve.go`.
-2dph does not run the agent loop. Compose: `docker compose --profile picoclaw up brain-mcp`
+PicoClaw speaks MCP at `POST /mcp` on `bin/brain/serve.go`. Compose profile
+`picoclaw` runs the official `sipeed/picoclaw` gateway plus `brain-mcp`
 (see [docs/picoclaw.md](../../docs/picoclaw.md)).

 ## Tool order (before a factual reply)
@@ -9,7 +9,7 @@ description: >-
 # postgres

 `bin/postgres/query.go` wraps vendored `bin/db/psql-yq`. Output is YAML
-(cheaper than psql ASCII, easy to slice with `yq`).
+(cheaper than psql ASCII, easy to slice with mikefarah/yq).

 ```bash
 bin/postgres/query.go --profile onlyoffice -s document_asset   # column list
@@ -11,7 +11,7 @@ description: >-
 ```bash
 bin/web/search.go "LadybugDB vector index"
 bin/web/search.go "model2vec multilingual" --category it
-bin/web/search.go "hypervisor" --site example.com --json | jq -r '.results[].url'
+bin/web/search.go "hypervisor" --site example.com --json | yq -r '.results[].url'
 bin/web/search.go "postgres partial index" --lang en --fresh year
 ```

@@ -43,7 +43,7 @@ found" unless the client refuses to call it absence.

 ```bash
 for i in $(seq 10); do
-  bin/web/search.go "test $i" -n 1 --refresh --json | jq -r .status
+  bin/web/search.go "test $i" -n 1 --refresh --json | yq -r '.status'
 done
 ```

@@ -0,0 +1,33 @@
+---
+name: yq
+description: >-
+  Use https://github.com/mikefarah/yq to work with YAML, JSON, XML, CSV,
+  TOML, HCL where it's efficient and less code. Use when slicing compose,
+  config, --json tool output, CSV/TOML/HCL/XML, or converting between those
+  formats. Not kislyuk Python yq. Not jq when yq already does the job.
+---
+
+# yq (mikefarah)
+
+Use https://github.com/mikefarah/yq to work with YAML, JSON, XML, CSV, TOML, HCL where it's efficient and less code.
+
+This is the Go `yq` (`yq --version` contains `mikefarah`). It is not
+kislyuk/yq (Python, jq-syntax, YAML-only wrapper). `bin/db/psql-yq` already
+calls this binary.
+
+Prefer `yq` over `python3 -c`, `jq`, or ad-hoc parsers when one expression
+reads or converts the file. Keep Python/Go for HTTP, binary protocols, and
+in-process tests.
+
+```bash
+yq '.services.picoclaw.image' compose.yaml
+yq -P . deploy/picoclaw/config.json          # JSON → YAML
+yq -o=json '.gates'                           # JSON stdin (qa/system_perf.py --json)
+yq -p=csv -o=json .
+yq -p=xml -o=json .
+yq -p=toml '.package.name' file.toml
+bin/brain/search.go "LadybugDB" --json | yq '.[].ref'
+bin/web/search.go "hypervisor" --json | yq -r '.results[].url'
+```
+
+Do not print secrets, PII, or `$HOME/.config/brain/` through `yq`.
Author	SHA1	Message	Date
eSlider	2b8f946edb	feat: D16 adjudication — 2v2 stays hypothesis until a rule fires. Tests / Test (push) Skipped Tests / OCR (tesseract fixture) (push) Skipped Tests / Release (semver) (push) Skipped Tests / Test (pull_request) Failing after 6s Details Tests / OCR (tesseract fixture) (pull_request) Failing after 4s Details Tests / Release (semver) (pull_request) Skipped Details temporal_freshness then authority_pairing; unresolved keeps (not confirmed). bin/facts/audit contradict. Gitea #29.	2026-08-14 11:40:16 +01:00
eSliderandGitHub	a331042488	feat: DuckDB quantiles in-process (gcc CGO), not Ladybug. (#34 ) Tests / Test (push) Failing after 6s Details Tests / OCR (tesseract fixture) (push) Failing after 4s Details Tests / Release (semver) (push) Skipped Details OQ3: internal/duckstats + bin/qa/stats.go. Zig stays Ladybug-only. mikefarah/yq for small structured slices. Gitea #30.	2026-08-14 11:32:23 +01:00
eSliderandGitHub	f99dfea104	feat: OCR scans with tesseract, drop docling from the default path. (#33 ) Tests / Test (push) Failing after 5s Details Tests / OCR (tesseract fixture) (push) Failing after 4s Details Tests / Release (semver) (push) Skipped Details pdftotext still wins on born-digital PDFs. Empty text layers go through pdftoppm + tesseract eng+deu. Optional OCR_ENGINE=paddle. Gitea #6.	2026-08-14 11:26:04 +01:00
eSliderandGitHub	bae1494258	ci: recall@5 SoT is Zig bin/brain/eval.go (#19 ) (#32 ) Tests / Test (push) Failing after 6s Details Tests / Release (semver) (push) Skipped Details * ci: recall@5 SoT is Zig bin/brain/eval.go. GitHub Actions rebuilds the repo corpus and runs the Go eval gate instead of Python bin/kb/eval. Audit self is a hard fail (Gitea #19). * ci: point eval at the checkout and keep DevOps in the corpus. /tmp/brain-eval cannot walk up to var/kb.lbug; KB_ROOT is required. Recall fragments must exist in README/docs so a repo-only rebuild gates.	2026-08-14 11:03:39 +01:00
eSliderandGitHub	c5be3f19be	feat: index facts extract and chats markdown on rebuild. (#31 ) Tests / Test (push) Failing after 5s Details Tests / Release (semver) (push) Skipped Details --with-facts / --facts-json write root=facts leafs; --with-chats picks up var/chats/md as info. WhatsApp sync stays out of v1 (Gitea #18).	2026-08-14 10:57:40 +01:00
eSliderandGitHub	a88dbb490c	feat: search --hop walks FROM_FILE to Person. (#30 ) Tests / Test (push) Failing after 4s Details Tests / Release (semver) (push) Skipped Details Parser no longer errors; hop 1 returns File, hop 3 reaches Person. Rebuild writes Leaf-[:FROM_FILE]->File so the walk is not empty on a fresh index (Gitea #17).	2026-08-14 10:51:35 +01:00
eSliderandGitHub	9d1a3f3c70	feat: write leafs incrementally without rebuilding the graph. (#29 ) Tests / Test (push) Failing after 4s Details Tests / Release (semver) (push) Skipped Details Ladybug 0.19 stays FTS/HNSW queryable on MERGE of new ids; DROP INDEX was the fatal path. bin/brain/add.go and POST /ingest land facts+info in one transaction so watch/mail/git can become leafs now (Gitea #14).	2026-08-14 10:46:59 +01:00