fix(#3683): wire gated learnings extraction into completion, align copy path (#3810)

* test(#3683): failing-first rows for learnings source resolution and wiring pins

* fix(#3683): wire gated learnings extraction into completion, align copy path

* test(#3683): register the learnings suite in the docs-guard lane, drop unverified markers

* fix(#3683): close review findings — per-item parsing, readdir guards, docs paths

* fix(#3683): route phase enumeration through the locator seam, fix assertion targets

* fix(#3683): merge execute-phase ack into the 3003 fragment, fix fidelity targets

* fix(#3663): replace the spent execute-phase ack entry with the 3683 re-arm

* chore(#3683): backfill changeset pr number

---------

Co-authored-by: sim <sim@local>

docs/FEATURES.md

@@ -2562,6 +2562,8 @@ capture_thought({
 
 Users who run a memory / knowledge-base MCP server (for example, ExoCortex-style servers, `claude-mem`, or `mem0`-style servers) can implement this tool name to have learnings routed into their knowledge base automatically with `project`, `phase`, and `source` metadata. Everyone else can use `/gsd-extract-learnings` without any extra setup — the `LEARNINGS.md` artifact is the feature.
 
+With `features.global_learnings: true`, phase completion runs the extraction for the just-completed phase automatically and copies the artifact to the global store at `~/.gsd/knowledge/` (#3683) — extraction and copy failures never block completion. With the gate off (the default), extraction stays fully manual.
+
 ---
 
 ### 114. Context-Window-Aware Prompt Thinning