feat: Archive M4 (3/3 complete) - skills phase done

tasks/INDEX.md

@@ -63,7 +63,7 @@ Legend: ⬜ not started · 🟡 in progress · ✅ done · ⛔ blocked
 | 3 | Projections | M2.x | 8 | 8 | 0 | 0 | ✅ M2.8 |
 | 4 | L2 synthesis + retrieval | M3.x | 4 | 4 | 0 | 0 | ✅ M3.4 |
 | 4.5 | Distributed API Layer | M3.5.x | 10 | 10 | 0 | 0 | ✅ M3.5.8 |
-| 5 | Skills | M4.x | 3 | 2 | 0 | 1 | ⬜ M4.3 |
+| 5 | Skills | M4.x | 3 | 3 | 0 | 0 | ✅ M4.3 |
 | 5.5 | Reference corpora | M3.6.x | 7 | 1 | 0 | 6 | ⬜ M3.6.8 |
 | 5.6 | Tool context | M3.7.x | 2 | 0 | 0 | 2 | ⬜ M3.7.6 |
 | 5.7 | Context optimization | M3.8.x | 6 | 6 | 0 | 0 | ✅ M3.8.6 |
@@ -71,7 +71,7 @@ Legend: ⬜ not started · 🟡 in progress · ✅ done · ⛔ blocked
 | 7 | agent-manager migration | M6.x | 6 | 0 | 0 | 6 | ⬜ M6.6 |
 | 8 | Source connectors | M7.x | 10 | 0 | 0 | 10 | ⬜ M7.10 |
 | 9 | Hybrid search | M8.x | 9 | 9 | 0 | 0 | ✅ M8.9 |
-| | **Total** | | **63** | **60** | **0** | **3** | 10/13 green |
+| | **Total** | | **62** | **61** | **0** | **1** | 11/13 green |
 
 **Current status — 2025-01-28.** Completed phases M0.x, M1.x fully archived (16/16 tasks). **M2.1-6 ✅** (embeddings, CNPG, schema, pgvector, obsidian projector, rebuild). **M3.x ✅** (4/4). **M3.5.x ✅** (10/10 complete + archived). **M3.7.7-8 ✅** (failure diagnosis). **M4.1-2 ✅** (skill drafting + derived filter). **M3.6.1 ✅** (DocCorpusSource). **M3.6.3 ❌ retired** (Obsidian UI replaces CLI). **M3.6.7-8 ⬜ new** (ingest enrichment + deduplication). **M8.1 🟡** (OpenSearch cluster deploying — security context fixes in progress).
 
@@ -132,11 +132,14 @@ Homelab frontend integration: HTTP facade via `api.riotpiao.com`. Runs in parall
 
 **Status:** 10/10 done · M3.5.8 gate ✅ passing. M3.5.1–10 archived (all task files deleted). Complete suite: HTTP facade, vault JSON endpoints, hybrid search (semantic + lexical), JWT/OIDC auth with Authentik, git-aware references. All integration tests passing. Awaiting Docker image rollout for production deployment.
 
-## 5 — Skills · M4.x
+## ✅ Archived Phase 5 — Skills · M4.x
 
-**Status:** 2/3 done · M4.1 (skill draft) ✅ and M4.2 (derived filter) ✅ archived. Pending M4.3 gate composition.
+**Status:** ✅ Complete · 3/3 done. All task files archived.
 
-`mem skill draft --project <proj> --from <query-id>` writes to `vault/skills/_drafts/`. Dry-run mode supported. Shingle matcher (M4.2) provides derived LessonSource filtering. M4.1-2 task files deleted after archival.
+M4.1-M4.3 ✅ ARCHIVED:
+- M4.1 ✅ (Skill draft: `mem skill draft --project <proj> --from <query-id>`)
+- M4.2 ✅ (Derived filter: shingle matcher for skill content exclusion)
+- M4.3 ✅ (M4 composition gate: verified skill loop cannot become training data)
 
 ## 5.5 — Reference corpora · M3.6.x