[CLAUDE] Docs+Skill: chốt session 6 — 3 skill refresh + 2 rule audit định kỳ

Pure docs work — 0 thay đổi code/test. 77 test vẫn pass (Domain 54 + Infra 23).

3 skill refresh stale (audit định kỳ §6.4 + §9.4 phát hiện):
- form-engine: "Phase 2 MVP missing PDF + form builder" → "Tier 3 feature-complete"
  + bỏ section duplicate "Gen mã HĐ chưa implement" (đã DONE Phase 3+6)
- permission-matrix: 12 menu cũ → ~60 menu key (Bg_*/Pe_*/PeWf_*/Catalogs)
  + inheritance roots 4 group + Budgets KHÔNG inherit (gotcha #35)
- ef-core-migration: "24 DbSet" → "52 bảng (15 migration)"

2 rule mới chốt:
- rules.md §6.4 — Audit + compact MD định kỳ (cadence + checklist + anti-pattern)
  Triết lý: KHÔNG rewrite toàn bộ. Compact + patch drift.
  Cron solution-erp-skill-audit-monthly mở rộng scope (skill + doc drift combined)
- rules.md §9.4 mở rộng cross-ref §6.4

Update STATUS Session 7+ priority + HANDOFF cảnh báo session 7 + migration-todos
Phase 9 Session 6 done sub.

Cron 2026-05-01 fire mai → combined audit theo checklist §6.4 + §9.4.

Session log đầy đủ: docs/changelog/sessions/2026-04-30-chot-session-6-md-audit-compact.md

Commit MD-only → CI skip (path filter gotcha #41).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

docs/changelog/migration-todos.md

@@ -84,6 +84,14 @@ Session logs: `2026-04-23-2300-purchase-evaluations.md` · `2026-04-24-chot-sess
 
 ## 📝 Phase 9 — UAT + Ops + carry over (Session 6+ active)
 
+### ✅ Session 6 done (2026-04-30 — pure docs work)
+
+- [x] **MD audit + compact** — STATUS -27%, HANDOFF -32%, migration-todos -35%, archive 51 row Phase 0-7 cũ
+- [x] **3 skill refresh** — `form-engine` Phase 2 MVP → Tier 3 feature-complete, `permission-matrix` 12 menu → ~60 + inheritance roots, `ef-core-migration` 24 DbSet → 52 bảng
+- [x] **Rule mới rules.md §7** — Khi nào viết test (timing rule 5-row table)
+- [x] **Rule mới rules.md §6.4** — Audit + compact MD định kỳ (cadence + checklist + anti-pattern)
+- [x] **rules.md §9.4** — Mở rộng skill audit cross-ref §6.4
+
 ### A. Hard blockers (chờ user / ops)
 
 - [ ] UAT thật 1 tuần với 2-3 user (30 demo: 16 sample + 14 Solutions thật)