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/COMMANDS.md

@@ -1197,7 +1197,7 @@ Extract reusable patterns, anti-patterns, and architectural decisions from compl
 | `--format` | Output format: `markdown` (default), `json` |
 
 **Prerequisites:** Phase has been executed (SUMMARY.md files exist)
-**Produces:** `.planning/learnings/{phase}-LEARNINGS.md`
+**Produces:** `.planning/phases/{phase-dir}/{padded-phase}-LEARNINGS.md`
 
 **Extracts:**
 - Architectural decisions and their rationale