feat: search --hop walks FROM_FILE to Person. (#30)

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).

docs/README.md

@@ -27,9 +27,9 @@ 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)).

docs/design.md

@@ -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
 

docs/roadmap.md

@@ -26,6 +26,8 @@ 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.
 
 ## Blockers
 
@@ -36,17 +38,14 @@ question
     ├─ facts / info roots  ← in
     ├─ web (D17)           ← in
     ├─ brain/add ACID      ← in
-    ├─ Cypher hop          ← #17  schema yes, search no
+    ├─ Cypher hop          ← in
     └─ facts+chats corpus  ← #18
 ```
 
-1. **[#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.
-2. **[#18](https://git.produktor.io/eSlider/2dph/issues/18) corpus** —
+1. **[#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/`.
-3. **[#19](https://git.produktor.io/eSlider/2dph/issues/19) CI eval** —
+2. **[#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
@@ -56,6 +55,6 @@ contradiction resolution, OQ3 duckdb-md export, OQ4 YAML-first leafs.
 
 ## Close epic #16 when
 
-- `--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
+- CI recall SoT is `bin/brain/eval.go` via Zig

docs/runbook.md

@@ -56,7 +56,7 @@ 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 =