[CLAUDE] Docs+Skill: chốt Session 14 wrap-up — PE 3-button workflow + Task 2 defer

Session 14 (2026-05-07) docs/skill update:

STATUS.md:
- Last updated + Phase summary count (95→96 test, 20 mig, 57 bảng, 41 gotcha)
- Recently Done row Session 14 chi tiết (3-button + Task 2 in-progress + DesignTime/Runtime DB gotcha)

HANDOFF.md:
- TL;DR Session 14 prepend với 1 commit + Task 2 defer
- 5 cảnh báo Session 15+: TraLai phase orphan / Task 2 sample seed / DesignTime
  vs Runtime DB / Budget N-stage defer / schema-diagram §17-19 defer

migration-todos.md: Phase 9 + Session 14 block 4 sub-task done + 2 defer task

Session log NEW `2026-05-07-2500-3-button-workflow.md`:
- Bối cảnh + spec 3-button (Duyệt/Trả lại/Từ chối) + implementation chi tiết
  (Domain policy expand + Service tách reject + FE button + dialog warning)
- Tests update (95→96 với +1 NEW Reject_To_TuChoi_Locks_Permanently)
- Task 2 in-progress: DesignTime vs Runtime DB gotcha + API exit 255 sớm
- Plan organization sau S14

Skill ef-core-migration:
- description + heading: 17→20 migration
- Bảng migration history thêm Mig 18-19 (PE) + Mig 20 (Contract)
- Section MỚI "N-stage workflow pattern (Mig 18-20)" — architecture decision
  với filtered unique trick + per-module migration packaging guideline
- Phase 8 update: 83→96 test breakdown

Skill contract-workflow:
- Section MỚI "Phase 9+ done (Mig 18-20 — Session 12/13/14)":
  * N-stage workflow PE + Contract (entity + filtered unique split + service
    refactor + tests + FE Designer + UsersPage cấp + API)
  * PE 3-button approval (Duyệt/Trả lại/Từ chối) Session 14
  * Defer: Budget N-stage / Phase TraLai=98 orphan

CLAUDE.md root: 16→20 migration + 55→57 bảng + 83→96 test
docs/rules.md §7: Phase 9 active 83→96 test

Verify: dotnet test 96 pass + npm build (skip — pure docs/skill update).

🎉 Session 14 wrap-up complete. Pushed 1 task (3-button) + Task 2 defer.
Cumulative since session start (13h17): 13 commit (1 button removal +
6 PE N-stage Chunk A-F + 5 Contract N-stage Chunk A,B,C,D,F + 1 3-button).

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

docs/changelog/migration-todos.md

@@ -157,6 +157,22 @@ Session log: `2026-04-28-chot-session-4-budget.md`.
 
 ## 📝 Phase 9 — UAT + Ops + carry over (Session 6+ active)
 
+### ✅ Session 14 done (2026-05-07) — PE 3-button workflow Duyệt/Trả lại/Từ chối (1 commit)
+
+User chỉ thị thay 2-button approval (Duyệt + Reject mơ hồ) bằng 3 hành động rõ:
+- Duyệt = forward
+- Trả lại = về DangSoanThao + Drafter sửa (smart reject Mig 16 + clear N-stage rows + Drafter resume jump-back)
+- Từ chối = Phase=TuChoi, phiếu khoá vĩnh viễn (17 handler Mig 16 lock edit)
+
+- [x] **Domain `PurchaseEvaluationPolicy.cs`** — NccOnly + NccWithPlan thêm (X → TuChoi) transition cho mọi phase trung gian + FromDefinition expand step (trừ DangSoanThao) thêm (step.Phase → TuChoi).
+- [x] **Service** `PurchaseEvaluationWorkflowService.TransitionAsync` — Reject branch tách 2 case: target=TuChoi giữ nguyên (no override / no RejectedFromPhase / no N-stage clear). target khác (DangSoanThao) → smart reject pattern.
+- [x] **FE PeWorkflowPanel** (admin + user mirror) — render 3 button "✓ Duyệt → X" / "← Trả lại" / "✗ Hủy / Từ chối" + decision logic + dialog confirm với warning red (Cancel) / amber hint (SendBack).
+- [x] **Tests** — rename Reject test target TuChoi→DangSoanThao + NEW Reject_To_TuChoi_Locks_Permanently + update NStage_Reject_Clears target. **95 → 96 test pass**.
+
+**Defer Session 15+:**
+- [ ] Task 2 sample seed N-stage (block trên DesignTime vs Runtime DB gotcha + API exit sớm khi DbInitializer seeding).
+- [ ] Phase TraLai = 98 enum orphan — có thể remove migration nếu cleanup, ko gây hại.
+
 ### ✅ Session 13 done (2026-05-07) — Mirror N-stage Contract (Mig 20, 5 commit per-chunk + skip Chunk E auto-bind)
 
 User chỉ thị mirror N-stage từ PE sang Contract. Budget defer (cần migration `AddBudgetVersionedWorkflow` trước — hardcoded `BudgetPolicy.Default` chưa có WorkflowDefinition entity). Pattern reusable đầy đủ từ PE.