[CLAUDE] Docs: Chunk E — chốt Session 21 turn 4 F1+F2+F3 PE Workflow advanced options (Mig 28)

Update docs theo rule §6.5 KEEP narrative:

- `docs/database/schema-diagram.md §14` title "Mig 22-28, S17-21" + thêm 6
  column Allow* inline trong Core ApprovalWorkflows block (inline comment
  F1/F2/F3 mapping). Bonus: 3 bảng (Steps + Levels) unchanged.

- `docs/STATUS.md` Last updated S21 t4 + count 27→28 mig (Mig 28 advanced
  options 6 column). UAT defer test count unchanged 84 (test-after-uat candidate
  bundle Plan C carry).

- `docs/HANDOFF.md` Insert TL;DR S21 t4 đầy đủ (trước S21 t3):
  - Q&A clarify 2 lượt chốt scope (F1 cả 2 mode admin, F1 Assignee runtime,
    F2 chỉ Cấp cuối, F3 Section 2 only, F2+F3 admin tick, F3 mọi approver
    active, test-after UAT)
  - 5 chunk narrative đầy đủ A schema → B BE → C FE Admin → D FE eOffice → E Docs
  - Pattern reusable: backward-compat option flags, boundary helper extension
  - State table cumulative + pending Plan C test-after catch-up

- NEW session log `docs/changelog/sessions/2026-05-13-1200-s21-turn4-pe-workflow-advanced-options.md`:
  - Trigger + Q&A 2 lượt
  - 5 chunk narrative chi tiết với code snippets
  - Pattern reusable 5 lessons learned
  - References file paths + spec context

Stats cumulative S21 t4:
- 28 mig (+1) · 59 tables · ~143 endpoints (+1) · 34 FE pages · 84 test pass
  (UAT defer test-after §7) · 45 gotcha unchanged · 17 memory · 6 skills
- 5 commits S21 t4 cumulative ready push remote

Pending: bro confirm push `0a3b747..HEAD` 8 commits ahead (S21 t3 + S21 t4).

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

docs/database/schema-diagram.md

@@ -715,7 +715,7 @@ CREATE TABLE PurchaseEvaluationDepartmentOpinions (
 CREATE UNIQUE INDEX IX_PEDeptOpinions_PEId_Kind ON PurchaseEvaluationDepartmentOpinions (PurchaseEvaluationId, Kind);
 ```
 
-## 14. ApprovalWorkflow V2 schema (Migration 22-25, Session 17-18 — 3 bảng mới + 3 column)
+## 14. ApprovalWorkflow V2 schema (Migration 22-28, Session 17-21 — 3 bảng mới + 9 column)
 
 Schema riêng song song WorkflowDefinition V1 (Mig 21) — pin per phiếu PE.
 V1 vẫn giữ cho phiếu cũ; V2 mới là active cho phiếu tạo từ Session 17 trở đi.
@@ -728,6 +728,15 @@ ApprovalWorkflows
 ├── ApplicableType (1=DuyetNcc, 2=DuyetNccPhuongAn, 3=Contract)
 ├── Name, Description, IsActive, ActivatedAt
 ├── IsUserSelectable (Mig 25, S18) — admin pin/unpin cho user pick lúc create phiếu
+│
+├── Mig 28 (S21 t4) — 6 advanced options "Cấu hình nâng cao" per workflow:
+├── AllowReturnOneLevel       bit DEFAULT 0  — F1 mode: Trả về 1 Cấp trước (peer review)
+├── AllowReturnOneStep        bit DEFAULT 0  — F1 mode: Trả về 1 Bước trước
+├── AllowReturnToAssignee     bit DEFAULT 0  — F1 mode: Trả về Người chỉ định (pick runtime)
+├── AllowReturnToDrafter      bit DEFAULT 1  — F1 mode: Trả về Drafter (S17 backward compat)
+├── AllowDrafterSkipToFinal   bit DEFAULT 0  — F2: Drafter trình thẳng Cấp cuối, skip trung gian
+├── AllowApproverEditDetails  bit DEFAULT 0  — F3: Approver chỉnh Section 2 lúc đang duyệt
+│
 └── (audit) CreatedAt, UpdatedAt, CreatedBy, UpdatedBy
 
 ApprovalWorkflowSteps  (FK Cascade ApprovalWorkflowId, FK Restrict DepartmentId)