[CLAUDE] Docs+Skill: chốt session 8 ending — patch count drift + skill refresh

Session 8 ending workflow theo template (kết thúc lúc ~13:00).

Patch drift count post Migration 16:
- docs/architecture.md §1: "(dbo schema, 19 bảng)" → 55 bảng
  (drift cũ session 6 chưa fix, giờ fix luôn)
- docs/database/schema-diagram.md §8 Migration history: thêm row 16
  AddTwoStageDeptApprovalAndSmartReject + Tổng 52 → 55 bảng
- .claude/skills/ef-core-migration/SKILL.md: 15→16 migration history,
  52→55 tables, description + code pointers + related links
- .claude/skills/README.md: ef-core-migration row "13 migration" → 16,
  gotchas count "32 bẫy" → 41 (drift cũ chưa fix)

Memory entry mới (cross-session pattern):
- feedback_per_chunk_commit.md: rule per-chunk commit cho big-feature
  (>500 LOC, multi-layer). Bài học S8 — 5 commit A-B-C-D-E thay vì
  1 monolithic. MEMORY.md index +1 entry (6 total).

Skip (intentional, theo §6.5 KHÔNG cố sửa):
- docs/gotchas.md: KHÔNG có gotcha mới đáng note (S8 dùng pattern
  đã proven, không có bug pitfall mới)
- docs/database/database-guide.md: KHÔNG có migration table chi tiết,
  chỉ conventions. Skip.
- contract-workflow + permission-matrix skills: KHÔNG touch (PE module
  only, contract policy chưa đổi, permission không liên quan bypass-review)

Verify:
- 77 unit test vẫn pass (54 Domain + 23 Infra)
- Build pass

Total session 8 cumulative: 6 commit (5 code A-B-C-D-E1 + 1 docs ending).

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

.claude/skills/README.md

@@ -17,7 +17,7 @@ Skill này là tài liệu chuyên biệt để Claude (và developer khác) dù
 | Skill | Mục đích | Trigger ví dụ | Trạng thái |
 |---|---|---|---|
 | `dependency-audit-erp` | Scan CVE NuGet + npm 2 FE, respect pin constraint (MediatR 12.4.1, Swashbuckle 6.9.0) | "npm audit", "dotnet vulnerable", "deps scan", "nâng cấp package" | ✅ New Tier 3 |
-| `ef-core-migration` | Tạo/revert EF Core 10 migration, 3-file rule, DesignTimeDbContextFactory, **13 migration history** (+ Phase 7 pending) | "thêm migration", "EF migration", "schema update", "snapshot lỗi" | ✅ Updated Phase 6 iter 2 |
+| `ef-core-migration` | Tạo/revert EF Core 10 migration, 3-file rule, DesignTimeDbContextFactory, **16 migration history** (Init → AddTwoStageDeptApprovalAndSmartReject) | "thêm migration", "EF migration", "schema update", "snapshot lỗi" | ✅ Updated Phase 9 (Mig 16) |
 | `iis-deploy-runbook` | 3 IIS site + win-acme cert + gitea-runner + LibreOffice + debug 500/502/SignalR prod + **G-084 IPv4/IPv6 hardening** | "prod 500", "IIS fail", "cert hết hạn", "restart app pool", "deploy IIS", "port hijack" | ✅ Updated (G-084) |
 
 ## Format chuẩn 1 skill
@@ -87,5 +87,5 @@ when-to-use:
 ## Related
 
 - `docs/CLAUDE.md` — quick rules + full stack context
-- `docs/gotchas.md` — 32 bẫy đã gặp
+- `docs/gotchas.md` — 41 bẫy đã gặp
 - `docs/changelog/migration-todos.md` — roadmap 5 phase + Tier 3