diff --git a/.claude/agent-memory/investigator/MEMORY.md b/.claude/agent-memory/investigator/MEMORY.md
index 1135436..232ffec 100644
--- a/.claude/agent-memory/investigator/MEMORY.md
+++ b/.claude/agent-memory/investigator/MEMORY.md
@@ -43,7 +43,7 @@ Common queries: `sys.columns`, `sys.triggers`, `__EFMigrationsHistory`, `COUNT(*
 - Grep `// Mock` / `alert(` / `setEditing(null) // close UI` — wire claim bugs
 
 ### Pattern: Memory cross-reference
-14 memory entries tại `C:\Users\pqhuy\.claude\projects\D--Dropbox-CONG-VIEC-SOLUTION\memory\`:
+16 memory entries tại `C:\Users\pqhuy\.claude\projects\D--Dropbox-CONG-VIEC-SOLUTION\memory\` (S20 +2 turn 11/12):
 - `MEMORY.md` — index
 - `project_solution_erp.md` — cumulative narrative S1-S17
 - `feedback_per_chunk_commit.md` — 5-chunk A-E discipline
@@ -58,6 +58,8 @@ Common queries: `sys.columns`, `sys.triggers`, `__EFMigrationsHistory`, `COUNT(*
 - `feedback_cron_monthly_limitation.md` — Cron SDK 7-day expire
 - `feedback_user_manual_style.md` — non-tech docs style
 - `feedback_node_cicd.md` — Node 20.x pin
+- `feedback_responsive_laptop_breakpoint.md` — 4-tầng responsive pattern (S20 t11)
+- `feedback_multi_agent_setup.md` — 3 sub-agents setup discipline (S20 t12)
 - `reference_session_prompts.md` — canonical session start template
 
 ### Pattern: External research priority sources
diff --git a/docs/HANDOFF.md b/docs/HANDOFF.md
index 8a0071c..76056ed 100644
--- a/docs/HANDOFF.md
+++ b/docs/HANDOFF.md
@@ -1,6 +1,85 @@
 # HANDOFF — Brief 5 phút cho session tiếp theo
 
-**Last updated:** 2026-05-11 (Session 20 turn 7 — **🎯 Admin Ẩn/Hiện + Đổi tên menu eOffice (Mig 27, 5 chunk: A schema → B BE API → C FE admin page → D FE user filter → E docs). User Q2=b: DisplayLabel CHỈ áp fe-user, admin giữ Label gốc. NEW MenuVisibilityPage trong fe-admin /system/menu-visibility — table inline edit Toggle Eye/EyeOff + Input rename + Lưu/Khôi phục. PATCH /api/menus/{key}. fe-user Layout filter 2 tầng + effectiveLabel. 27 mig, ~142 endpoints, 34 FE pages, +1 menu key MenuVisibility leaf System. 81 test pass unchanged.**)
+**Last updated:** 2026-05-11 22:00 (Session 20 WRAP turns 1-12 — **🎯 14 commit từ `9dee00d` → `ae1814c`. PE Detail UI restructure (t1-5) + Manual budget drop tên field (t6) + Mig 27 admin menu eOffice (t7) + NCC 5-màu palette + Winner icon ✓ + AddSupplier auto-fill master + Responsive laptop nhỏ 4-tầng (t8-11) + Setup 3 sub-agents Investigator/Implementer/Reviewer (t12). Stats: 27 mig · 59 tables · ~142 endpoints · 34 FE pages · 61 menu key · 81 test pass · 44 gotcha · 16 memory (+2: responsive + multi-agent) · 3 sub-agents seeds-only state (chưa spawn work). Trial Week 1 candidate S21: Contract V2 wire Mig 28+29 mirror PE pattern.**)
+
+## TL;DR Session 20 WRAP (turns 1-12 chốt 2026-05-11)
+
+User UAT live iteration liên tục — 12 turns trong 1 ngày (sáng-trưa-chiều-tối-đêm). 14 commit cumulative.
+
+### 3 chủ đề lớn
+
+1. **PE Detail UI restructure** (turns 1-5 + 6 + 8-10): User yêu cầu 3 polish UX core + 4 polish nhỏ.
+   - Turn 1-5 wrap commit `9dee00d→f2f01f4→f8e5675`: Section reorder (Hạng mục lên #2 + auto-seed 1 row từ gói thầu) → Nested grid HangMucCard NCC expand (drop SuppliersTab dead code) → Section Ý kiến gộp đồng cấp 1 box / Step
+   - Turn 6 `f568945`: Manual budget "Nhập tay" drop tên field, chỉ giữ số tiền + VND format
+   - Turn 8-10: NCC palette 5-màu cycle + Winner icon ✓ đậm + hover transition + AddSupplier auto-fill master data 4 field
+2. **Admin menu eOffice management** (turn 7): Mig 27 `IsVisible + DisplayLabel` cột MenuItem + PATCH `/api/menus/{key}` + NEW `MenuVisibilityPage` ~210 LOC + fe-user Layout filter !isVisible + render `displayLabel || label`. Admin sidebar luôn dùng Label gốc (Q2=b).
+3. **Infrastructure** (turns 11-12):
+   - Turn 11 responsive 4-tầng pattern cho laptop nhỏ → memory `feedback_responsive_laptop_breakpoint.md`
+   - Turn 12 SETUP 3 sub-agents (Investigator + Implementer + Reviewer) + em main coordinator → memory `feedback_multi_agent_setup.md`
+
+### Stats cumulative
+
+| Metric | Trước S20 | Sau S20 | Δ |
+|---|---|---|---|
+| DB tables | 59 | 59 | 0 |
+| Migrations | 26 | **27** | +1 (Mig 27 menu visibility) |
+| Endpoints | ~141 | **~142** | +1 (PATCH /menus/{key}) |
+| FE pages | 33 | **34** | +1 (MenuVisibilityPage) |
+| Menu keys | ~60 | **~61** | +1 (MenuVisibility) |
+| Unit tests | 81 | 81 | 0 (Phase 9 UAT defer §7) |
+| Gotchas | 44 | 44 | 0 |
+| Memory entries | 14 | **16** | +2 (responsive t11 + multi-agent t12) |
+| Skills | 6 | 6 | 0 |
+| Sub-agents | 0 | **3** | +3 (Inv + Imp + Rev seeds) |
+| Commits S20 | — | **14** | (`9dee00d` → `ae1814c`) |
+
+### Multi-agent state chốt session
+
+3 sub-agents vừa setup turn 12 → **seeds-only state, chưa spawn work**. KHÔNG có findings để flush cross-agent learnings ở session này.
+
+**Trial Week 1 sẽ kick off Session 21:**
+- Investigator pre-flight: audit PE V2 schema patterns (Mig 22-27) + Permission flow → spec Contract V2
+- Implementer Chunk A-E (Mig 28 ALTER Contract + Mig 29 ContractLevelOpinions + Service ApproveV2Async + Controller + FE mirror)
+- Reviewer pre-commit verify gotcha #42 (V1/V2 dual schema branch)
+- Em main: architecture decisions + scope refusals + final synthesize
+
+### Memory entries mới capture S20
+
+1. `feedback_responsive_laptop_breakpoint.md` (t11) — 4-tầng pattern: sidebar w-60 xl:w-72 + workspace 2-panel lg:260 xl:320 + Section padding xs/sm responsive + Card flex-wrap. Phân biệt `lg` vs `xl` breakpoint quan trọng cho laptop nhỏ.
+2. `feedback_multi_agent_setup.md` (t12) — Decision gate 6-criteria. Anthropic + Cognition hybrid. Implementer ACCEPT/REFUSE strict rules. Windows MAX_PATH pitfall (drop isolation worktree). NAMGROUP s41-s43 ROI curve.
+
+### Pending Session 21+ (cumulative carry over)
+
+**Plan cha B (HIGH priority) — Contract V2 wire Mig 28+29:** mirror PE pattern S17-S19 + S20 turn 7. Audit-reuse memory `feedback_audit_reuse_before_clone` áp dụng — discriminator `ApplicableType.Contract=3` đã chung 80% với PE schema V2. 6-task plan:
+- Task 1: Mig 28 ALTER `Contract.ApprovalWorkflowId? + CurrentApprovalLevelOrder?`
+- Task 2: Mig 29 CREATE `ContractLevelOpinions` (mirror PE Mig 26 UNIQUE + FK Cascade/Restrict)
+- Task 3: `ContractWorkflowService.ApproveV2Async` branch + UPSERT opinion
+- Task 4: `ContractCreatePage` Workspace Select V2 (validate ApplicableType=3)
+- Task 5: Pin V2 mặc định cho ContractType qua Designer (admin)
+- Task 6: `ContractDetailContent` Section "Ý kiến cấp duyệt" V2 dynamic mirror S20 Chunk C
+
+**Plan cha C (HIGH priority) — Test coverage gap fill (§7):**
+- Test regression B4 silent 403 S18 (HIGH — vi phạm rule §7 test-before bug fix)
+- Test V2 Service wire `ApproveV2Async` UPSERT opinion (Mig 26) + Section gộp render (S20 t1-5 Chunk C)
+- Test Mig 25 PATCH `/user-selectable` endpoint
+- Test PATCH `/api/menus/{key}` Mig 27 (mới)
+
+**Plan cha D — Hard blockers ops (chờ user/ops):** UAT thật 1 tuần / SMTP / Rotate creds / SQL backup schedule / win-acme fix / remove `.huypham.vn` binding
+
+**Plan cha E — Phân quyền strict V2 + drop legacy V1:**
+- List/Inbox/Detail filter actor scope (V2 đã đúng — `ResolveV2InboxIdsAsync`)
+- Drop tables V1 sau UAT confirm: WorkflowDefinitions/Steps/Approvers + column RejectedAtStepIndex/RejectedFromPhase
+- Mig 30 drop Mig 15 PurchaseEvaluationDepartmentOpinions cleanup
+
+**Plan cha F — Audit định kỳ 2026-06-01:** skill stale (`ef-core-migration` "21" → 27 / `dependency-audit-erp` 41 → 44) + `schema-diagram` §16-21 + memory consolidate xem có duplicate
+
+**Plan cha G NEW — Multi-agent trial 4 tuần (Week 1-4):** evaluate ROI keep/tune/archive 3 sub-agents
+
+### Audit cadence
+
+- Lần gần nhất: 2026-05-04 manual trễ 4 ngày
+- Lần kế: **2026-06-01** combined audit
+- Drift sau S20: Mig 27 + 1 menu key + +2 memory entries + 3 sub-agents NEW + (no gotcha new). `ef-core-migration` skill "21 migration" stale → thực 27 sau S20 t12
 
 ## TL;DR Session 20 turn 7 — Admin Ẩn/Hiện + Đổi tên menu eOffice (Mig 27)
 
diff --git a/docs/STATUS.md b/docs/STATUS.md
index 565067b..c2c75a0 100644
--- a/docs/STATUS.md
+++ b/docs/STATUS.md
@@ -2,7 +2,8 @@
 
 > **Update rule:** trước khi bắt đầu 1 task → ghi row vào `🔥 In Progress`. Xong → chuyển sang `✅ Recently Done`.
 
-**Last updated:** 2026-05-11 (Session 20 turn 7 — **🎯 Admin Ẩn/Hiện + Đổi tên menu eOffice (Mig 27). 5 chunk `2ea2d27`→`ef394f8`→`059bfcb`→`1ed6530`→Chunk E Docs. User Q2=b: DisplayLabel CHỈ áp fe-user, admin sidebar giữ Label gốc. Domain MenuItem +IsVisible(true) +DisplayLabel(200). Mig 27 AddVisibilityAndDisplayLabelToMenuItems. BE PATCH /api/menus/{key} [Authorize Policy=Permissions.Update]. NEW FE-admin MenuVisibilityPage ~210 LOC (table inline edit per-row + Save dirty + Khôi phục mặc định + Toggle Eye/EyeOff + 4 StatCard). fe-user Layout filterForUser 2 tầng (USER_HIDDEN_KEYS hardcode + !isVisible dynamic) + effectiveLabel(displayLabel || label) replace 3 callsite. fe-admin Layout KHÔNG đụng. +1 menu key MenuVisibility "Menu eOffice" leaf System Order=94. 27 mig, 59 tables, ~142 endpoints, 34 FE pages, 81 test pass (Q4 UAT defer).**)
+**Last updated:** 2026-05-11 22:00 (Session 20 wrap turns 1-12 — **🎯 14 commit `9dee00d` → `ae1814c`. PE Detail UI restructure 3 yêu cầu (t1-5) + Manual budget drop tên (t6) + Mig 27 admin menu eOffice (t7) + NCC palette 5-màu cycle + Winner icon ✓ đậm + AddSupplier auto-fill master + Responsive laptop nhỏ 4-tầng pattern (t8-11) + Multi-agent infrastructure setup 3 sub-agents (t12). 27 mig (+1) · 59 tables · ~142 endpoints (+1) · 34 FE pages (+1) · 61 menu key (+1) · 81 test pass unchanged · 44 gotcha · 16 memory entries (+2) · 3 sub-agents NEW. Phase 9 UAT iteration mode.**)
+**S20 turn 7:** 2026-05-11 17:00 (Session 20 turn 7 — **🎯 Admin Ẩn/Hiện + Đổi tên menu eOffice (Mig 27). 5 chunk `2ea2d27`→`ef394f8`→`059bfcb`→`1ed6530`→Chunk E Docs. User Q2=b: DisplayLabel CHỈ áp fe-user, admin sidebar giữ Label gốc. Domain MenuItem +IsVisible(true) +DisplayLabel(200). Mig 27 AddVisibilityAndDisplayLabelToMenuItems. BE PATCH /api/menus/{key} [Authorize Policy=Permissions.Update]. NEW FE-admin MenuVisibilityPage ~210 LOC (table inline edit per-row + Save dirty + Khôi phục mặc định + Toggle Eye/EyeOff + 4 StatCard). fe-user Layout filterForUser 2 tầng (USER_HIDDEN_KEYS hardcode + !isVisible dynamic) + effectiveLabel(displayLabel || label) replace 3 callsite. fe-admin Layout KHÔNG đụng. +1 menu key MenuVisibility "Menu eOffice" leaf System Order=94. 27 mig, 59 tables, ~142 endpoints, 34 FE pages, 81 test pass (Q4 UAT defer).**)
 **S20 prev:** 2026-05-11 (Session 20 — **🎯 PE Detail UI restructure 3 yêu cầu user UX. 4 chunk per-commit `9dee00d` → `2bba851` → `f2f01f4` → (current Chunk D Docs).** Q1=a (giữ Section "Chọn NCC TP" riêng), Q2=a "1 hạng mục trước tiên" (NCC shared, demo 1 hạng mục), Q3=a (chỉ hiện NV đã ký), Q4 public luôn (skip dotnet test mỗi chunk theo memory `feedback_uat_skip_verify`, vẫn `npm run build` × 2 app mỗi chunk vì có rename/remove function). **Chunk A (`9dee00d`)**: BE `CreatePurchaseEvaluationCommandHandler` thêm 1 PurchaseEvaluationDetail mặc định khi tạo phiếu — GroupCode="01", GroupName="Hạng mục chính", NoiDung=TenGoiThau, DonGiaNganSach=ThanhTienNganSach=Budget.TongNganSach hoặc BudgetManualAmount fallback 0; Changelog Insert audit. FE reorder PeDetailTabs (mirror 2 app) 1.Thông tin / 2.Hạng mục (lên #2) / 3.Chọn NCC / 4.NCC tham gia / 5.Ý kiến. **Chunk B (`2bba851`)**: ItemsTab restructure thành list `HangMucCard` (1 card / 1 hạng mục, expanded=true mặc định cho 1 hạng mục demo). Header card: GroupCode + NoiDung + 3 stat (KL/ĐG/TT) + NS link Δ nếu có + Pencil/Trash actions + ▼/▶ toggle expand. Expand body: NCC inline table columns NCC / Liên hệ / Điều khoản TT / **File báo giá** / ĐG chưa VAT / ĐG có VAT / Thành tiền / Action. Quote inline click cell → QuoteDialog cũ reuse. Add NCC + Sửa NCC reuse AddSupplierDialog/EditSupplierDialog cũ. Winner ✓ button mỗi NCC row. Drop function `SuppliersTab` (dead code ~134 LOC, replace bằng HangMucCard expand panel). Giữ AddSupplierDialog + EditSupplierDialog + SupplierAttachmentsCell (HangMucCard call lại). Section layout cuối: 1.Thông tin / 2.Hạng mục + Báo giá NCC (nested) / 3.Chọn NCC TP thắng thầu / 4.Ý kiến cấp duyệt — 4 section. **Chunk C (`f2f01f4`)**: Section Ý kiến restructure render layer (KHÔNG đụng Mig 26 schema — vẫn UPSERT 1 row / Level). LevelOpinionsSectionV2 forEach step → 1 `StepOpinionsBox` (replace grid-cols-2 cho N approver). Box header: "Bước N — Tên" + dept badge emerald + "X/Y đã duyệt" counter. Body: filter opinions theo step.order → sort levelOrder asc, signedAt asc → render `StepOpinionEntry` per signed opinion (tên NV + Cấp badge slate + admin override badge amber nếu có + emerald rounded-full timestamp + comment text). NV chưa duyệt KHÔNG hiển thị (Q3=a). Drop function `LevelOpinionBox` (replaced). Mirror fe-admin + fe-user. Verify build pass cả 2 app sau khi catch TS6133 `SuppliersTab` + `SupplierAttachmentsCell` unused (đã giải quyết: drop SuppliersTab, restore SupplierAttachmentsCell vào HangMucCard cột "File báo giá"). 81 test pass (no change — UAT defer)**)
 
 ## 📍 Phase hiện tại: **Phase 9 active — UAT V2 testing với user thật** — **59 DB tables (+1 PurchaseEvaluationLevelOpinions Mig 26), 26 migrations (+1 Mig 26), ~141 API endpoints (no new — UPSERT auto qua Service hook không endpoint riêng, Q1=1B), 33 FE pages. 81 unit test pass** (58 Domain + 23 Infra — no change S19, feature UAT defer test theo §7). 44 gotcha. 30 demo user + 1 test user UAT. 6 skill. **5 trạng thái phiếu** (Nháp/Đã gửi duyệt/Trả lại/Từ chối/Đã duyệt). **2 Workflow schemas đồng tồn tại** post-Session 17: (1) Mig 21 `WorkflowDefinition` flat (V1) — pin với PE/Contract cũ + match Dept+PositionLevel. (2) Mig 22-26 `ApprovalWorkflow` (V2) — pin với PE mới + match ApproverUserId 1-1, Steps/Levels group by Order, Bước (Phòng) > Cấp (N NV OR-of-N), Mig 25 +IsUserSelectable admin pin per version, **Mig 26 +PeLevelOpinions sign-off dynamic theo Level**. Service PE branch theo `ApprovalWorkflowId` set or null. Sau UAT chốt → migrate + drop V1 + Contract V2 wire.
@@ -62,6 +63,7 @@
 
 | Ngày | Ai | Task | Commit |
 |---|---|---|---|
+| 2026-05-11 | Claude | **🎯 SESSION 20 turns 6 + 8-12 — PE polish (NCC palette + autofill + responsive) + Multi-agent setup (7 commit `f568945` → `ae1814c`)** — Sau turn 7 wrap-up Mig 27, user iterate 7 polish/feature lớn nhỏ. **Turn 6 (`f568945`)** Manual budget "Nhập tay" drop tên field — 3 file × 2 app mirror (BudgetFieldRow + WorkspaceCreateView + HeaderForm) bỏ Input "Tên" UI khỏi manual mode, BE save `budgetManualName: null` luôn, VND format `1.000.000` + suffix đ. **Turn 8 (`3ec7b5a`)** AddSupplier +Số tiền inline + NCC 5-màu palette + Winner badge "🏆 Trúng thầu" — AddSupplierDialog +prop detailId? +form thanhTien, sequential POST /suppliers (response {id}) → POST /quotes (nếu detailId + thanhTien > 0). NCC_PALETTES const 5 màu literal Tailwind (blue/purple/sky/teal/pink) cycle theo idx. Winner row override emerald-500 border-l + bg-emerald-100/70 + shadow-sm + ring-1 emerald-300 + badge rounded-full bg-emerald-600 text-white "🏆 Trúng thầu". **Turn 9 (`83aae8e`)** User feedback bỏ badge → revert icon ✓ stick cũ nhưng đậm hơn (text-base font-bold emerald-700) + tên NCC winner text-emerald-900 + hover transition (winner hover:bg-emerald-200/70, non-winner hover:bg-white/80 hover:shadow-sm). **Turn 10 (`66551db`)** AddSupplierDialog auto-fill từ master data khi chọn NCC dropdown — onChange lookup picked supplier, setForm ghi đè 4 field (contactName ← contactPerson / contactPhone ← phone / contactEmail ← email / note ← note). Hint emerald "✓ Đã tự điền từ Master". User vẫn override được. **Turn 11 (`6e338f7`)** Responsive cho laptop màn hình nhỏ 1280-1366px — 4-tầng pattern: sidebar fe-admin + fe-user `w-72` → `w-60 xl:w-72` (+48px lg) / PE Workspace 2-panel `lg:[320px_1fr]` → `lg:[260px_1fr] xl:[320px_1fr]` (+60px lg) / Section padding `px-5 py-4` → `px-3 py-3 sm:px-5 sm:py-4` (+16px xs) / HangMucCard `gap-3 p-3` → `flex-wrap gap-2 p-2 sm:gap-3 sm:p-3` (+8px xs). Net gain trên 1366px ~+132px width cho NCC table area. Memory `feedback_responsive_laptop_breakpoint.md` capture pattern. **Turn 12 (`ae1814c`)** SETUP MULTI-AGENT INFRASTRUCTURE 3 sub-agents (Investigator READ cyan + Implementer WRITE conditional yellow + Reviewer READ adversarial red) + em main coordinator. Pre-flight decision gate 6/6 ✅. Phase 1-4 execute: `.claude/agents/` 4 file (README ~9.7KB + investigator + implementer + reviewer) + `.claude/agent-memory/` 3 MEMORY.md seed (~6KB each). Customize SOLUTION_ERP: skills preload mỗi agent (reuse 6 skills hiện có) + bearer test (admin@solutions / nv.test@solutions) + prod UAT URL + Phase 9 UAT mode + DB Dev/Design distinct. Windows MAX_PATH pitfall handled — drop `isolation: worktree` khỏi implementer.md (project path 51 chars + Dropbox-managed nested overflow 260+ chars). Memory `feedback_multi_agent_setup.md` capture decision gate + ACCEPT/REFUSE criteria + NAMGROUP s41-s43 ROI reference. 3 agents **chưa spawn work** ở S20 turn 12 — seeds-only state. Trial Week 1 candidate Contract V2 wire Mig 28+29 (mirror PE pattern proven). **Stats cumulative S20:** 27 mig (+1 Mig 27 from turn 7) · 59 tables · ~142 endpoints (+1 PATCH /menus/{key}) · 34 FE pages (+1 MenuVisibilityPage) · ~61 menu key (+1) · 81 test pass unchanged · 44 gotcha unchanged · **16 memory entries (+2: responsive + multi-agent)** · 6 skills unchanged · **3 sub-agents NEW** · 14 commits S20. | `f568945` (t6) · `3ec7b5a` (t8) · `83aae8e` (t9) · `66551db` (t10) · `6e338f7` (t11) · `ae1814c` (t12) · (current Docs t13 wrap) |
 | 2026-05-11 | Claude | **🎯 SESSION 20 turn 7 — Admin Ẩn/Hiện + Đổi tên menu eOffice (Mig 27, 5 chunk `2ea2d27`→`ef394f8`→`059bfcb`→`1ed6530`→Chunk E Docs)** — User UAT yêu cầu "tính năng Ẩn Hiện và Đổi tên hiển thị của các Menu bên ngoài Office, làm trong Trang Admin Page". Hỏi xác nhận "chưa có" — đúng. User clarify Q2=b "edit hiển thị bên ngoài, chỉ của eOffice thôi" → admin sidebar luôn giữ Label gốc, DisplayLabel CHỈ áp fe-user. Q1=a global (không per-role), Q3=a giữ USER_HIDDEN_KEYS hardcode + tầng IsVisible dynamic combine, Q4 UAT skip test. **Chunk A** Domain MenuItem +IsVisible bool=true +DisplayLabel string?(200) + EF config + Migration 27 AddVisibilityAndDisplayLabelToMenuItems (2 AddColumn) — 3-file rule, apply LocalDB _Dev + _Design OK. **Chunk B** BE API: MenuNodeDto + MenuItemDto +isVisible +displayLabel (sau CRUD flags trước Children). GetMyMenuTreeQueryHandler pass through, KHÔNG filter server-side — 2 FE app tự quyết. UpdateMenuItemCommand + Validator + Handler (trim DisplayLabel whitespace → null). MenusController +PATCH /api/menus/{key} [Authorize Policy=Permissions.Update] body {isVisible, displayLabel}. **Chunk C** Domain MenuKeys +MenuVisibility const + All[] + DbInitializer +leaf "Menu eOffice" Icon=Eye Order=94 (Workflows shift 94→95). Manual seed Mig 27 LocalDB _Dev (INSERT MenuItems + Permissions Admin). FE Admin: types/menu.ts +isVisible +displayLabel, lib/menuKeys.ts +MenuVisibility, Layout resolver +/system/menu-visibility, App.tsx +Route. NEW pages/system/MenuVisibilityPage.tsx ~210 LOC: PageHeader + 4 StatCard (Tổng/Hiển thị/Đã ẩn/Đã đổi tên) + Search + Table 5 cột (Key mono + parentKey ↳ / Tên gốc / Input "Tên hiển thị" inline placeholder "Mặc định: {label}" / Toggle button emerald-Eye / amber-EyeOff / Lưu khi dirty + Khôi phục khi custom). PATCH endpoint, invalidate ['menus','all'] + ['my-menu'] trigger live update sidebar. Row hidden bg-amber-50/40 highlight, custom label bg-brand-50/40. **Chunk D** fe-user types/menu.ts mirror. Layout.tsx filterForUser 2 tầng (USER_HIDDEN_KEYS structural + !isVisible dynamic). Helper effectiveLabel(n) = displayLabel?.trim() || label. Replace 3 callsite {node.label} → {effectiveLabel(node)}. USER_FIXED_TOP "__inbox" entry +isVisible:true cho type check pass. **fe-admin Layout KHÔNG đụng** — admin sidebar render Label gốc + show hết menu (user Q2=b). **Chunk E Docs (current)**. **Stats Session 20 turn 7**: 26→27 mig, 59 DB tables (no change), ~141→142 endpoints, 33→34 FE pages, ~60→61 menu key, 81 test pass (Q4 UAT defer), 44 gotcha (no new). Memory entries 14 (no new). | `2ea2d27` (A Mig 27) · `ef394f8` (B BE API) · `059bfcb` (C FE admin) · `1ed6530` (D FE user) · (current E Docs) |
 | 2026-05-11 | Claude | **🎯 SESSION 20 — PE Detail UI restructure 3 yêu cầu UX (4 chunk: 9dee00d→2bba851→f2f01f4→Chunk D Docs)** — User UAT live phản hồi "Logic OK rồi, điều chỉnh UI Duyệt NCC 1 tý": (1) Hạng mục lên trên + auto-tạo 1 row từ gói thầu, (2) NCC expand dưới hạng mục, (3) Section Ý kiến gộp đồng cấp cùng Phòng. Q&A clarify trước code (4 câu Q1=a/Q2=a "1 hạng mục"/Q3=a "chỉ hiện signed"/Q4 "public luôn demo thôi"). 4 chunk per-commit pattern `feedback_per_chunk_commit`. **Chunk A** BE `CreatePurchaseEvaluationCommandHandler` + INSERT 1 PurchaseEvaluationDetail mặc định + Changelog (GroupCode=01, NoiDung=TenGoiThau, ThanhTienNganSach=Budget.TongNganSach hoặc BudgetManualAmount fallback 0) + FE reorder PeDetailTabs section. **Chunk B** ItemsTab restructure list HangMucCard (1 card / hạng mục, expanded=true default cho demo 1 hạng mục). Header: GroupCode + NoiDung + 3 stat (KL/ĐG/TT) + NS link Δ + Pencil/Trash + ▼/▶ toggle. Expand body: NCC inline table 8 cột (NCC/Liên hệ/Điều khoản TT/File báo giá/ĐG chưa VAT/ĐG có VAT/Thành tiền/Action). Click cell quote → QuoteDialog reuse. Add NCC/Edit NCC reuse 2 dialog cũ. Winner ✓ button per row. Bỏ Section 4 "NCC tham gia" (gộp vào Section 2 nested) → 4 section final. Drop SuppliersTab function ~134 LOC dead code (replace bằng HangMucCard expand). Giữ AddSupplierDialog + EditSupplierDialog + SupplierAttachmentsCell (HangMucCard reuse). **Chunk C** Section Ý kiến gộp đồng cấp cùng Phòng. LevelOpinionsSectionV2 forEach step → 1 `StepOpinionsBox` (replace grid-cols-2 N approvers). Header: "Bước N — Tên" + dept badge emerald + "X/Y đã duyệt" counter. Body: filter opinions theo step.order → sort levelOrder asc + signedAt asc → render `StepOpinionEntry` per signed (tên NV + Cấp badge slate + admin override amber + timestamp emerald rounded-full + comment). NV chưa duyệt KHÔNG hiển thị (Q3=a). KHÔNG đụng Mig 26 schema (vẫn UPSERT 1 row / Level qua Service). Drop LevelOpinionBox function. Mirror fe-admin + fe-user mỗi chunk. **Verify**: dotnet build pass (Chunk A) + npm build × 2 app pass (Chunk B/C — catch TS6133 SuppliersTab unused + SupplierAttachmentsCell unused, fix re-add cột File báo giá vào nested table). **Test skip** Phase 9 UAT iteration (81 test pass unchanged). **Stats unchanged**: 26 mig, 59 DB tables, ~141 endpoint, 33 FE pages, 44 gotcha, 81 test. **Pending S21+**: Test regression B4 silent 403 (HIGH §7), Test V2 Service wire ApproveV2Async + Section gộp (Chunk C), Test Mig 25 PATCH user-selectable, Contract V2 (Mig 27/28 mirror PE), phân quyền strict V2, drop legacy V1 cleanup. | `9dee00d` (A) · `2bba851` (B) · `f2f01f4` (C) · (current D Docs) |
 | 2026-05-09 | Claude | **🎯 SESSION 19 — PE Section 5 V2 dynamic theo ApprovalWorkflowLevel + Mig 26 (4 commit: 873e7a1 polish 3 button + 77a3058/90baa8e/6e913b3/Chunk D Mig 26)** — User feedback Section 5 hiện CỨNG 4 box (PheDuyet/CCM/MuaHàng/SmPm Mig 15 từ Phase 8) → cần động theo Workflow V2 đã pin: forEach Step (Phòng) → forEach Level (Cấp) → forEach NV → 1 OpinionBox với ý kiến + tên người ý kiến. Bước 1 Phòng A có 2 NV → 2 box ngang hàng. **5 câu chốt spec trước code:** Q1=1B (gắn — Service auto sync khi duyệt, KHÔNG form input rời), Q2=2A+Admin (NV chính chủ + Admin override với SignedByUserId track actual signer), Q3=chuyển V2 hết (phiếu V1 legacy fallback Mig 15 4 box readOnly), Q4=4C+bonus (Phase=DaDuyet/TuChoi khoá; Admin có quyền duyệt thay; comment empty → "(duyệt — không ý kiến)" placeholder), Q5=5A (layout group Step header "Bước N — Phòng X" + grid-cols-2 cho N approvers). **3 chunk per-commit (memory `feedback_per_chunk_commit`):** Chunk A (`77a3058`) Domain entity `PurchaseEvaluationLevelOpinion : AuditableEntity` (PEId+LevelId UNIQUE composite, Comment nvarchar(2000), SignedAt datetime2, SignedByUserId Guid, SignedByFullName nvarchar(200) denorm) + EF config FK Cascade Pe + Restrict Level + ApplicationDbContext + IApplicationDbContext DbSet + **Migration 26** `AddPeLevelOpinionsForV2` (1 CREATE TABLE + 2 FK + 2 index — UNIQUE composite + IX LevelId). 3-file rule. Apply LocalDB SolutionErp_Dev OK. Chunk B (`90baa8e`) Service `PurchaseEvaluationWorkflowService.ApproveV2Async` sau line log approval → UPSERT row PurchaseEvaluationLevelOpinions cho Cấp hiện tại: match level theo `ApproverUserId == actorUserId` (multi-NV cùng Cấp OR-of-N), fallback first khi Admin override (FE detect SignedByUserId !== Level.ApproverUserId hiển thị "Admin duyệt thay"). Reject KHÔNG sync. Empty/whitespace comment → "(duyệt — không ý kiến)" placeholder. Helper `ResolveActorFullNameAsync(actorUserId, isSystem)` lookup denorm SignedByFullName từ Users (fallback "(System)" / "(unknown)"). DTO `PurchaseEvaluationLevelOpinionDto` 15 fields (LevelId/StepOrder/StepName/StepDepartmentId/StepDepartmentName/LevelOrder/LevelName/ApproverUserId/ApproverFullName/Comment/SignedAt/SignedByUserId/SignedByFullName). GET handler `GetPurchaseEvaluationQueryHandler` Include LevelOpinions + helper `BuildLevelOpinionsAsync` JOIN ApprovalWorkflows.Steps.Levels + Departments + Users → denorm DTO list. Empty list cho phiếu V1 / V2 chưa có cấp duyệt → FE fallback. Chunk C (`6e913b3`) FE Section 5 V2 dynamic: type `PeLevelOpinion` + `PeDetailBundle.levelOpinions[]`. Section 5 conditional: `evaluation.approvalWorkflowId` set → `<LevelOpinionsSectionV2/>` (V2 dynamic), else `<DepartmentOpinionsSection/>` readOnly fallback (V1 legacy giữ Mig 15 4 box). Component `LevelOpinionsSectionV2` group theo step.order: header "Bước N — <name>" + dept badge emerald + hint "(N người duyệt)" khi totalApprovers > 1; body grid-cols-2 cho `step.levels.flatMap(level => level.approvers.map(approver => <LevelOpinionBox/>))`; lookup opinion theo (stepOrder, levelOrder, approverUserId). `LevelOpinionBox` read-only: title "Cấp N — <ApproverFullName>", badge amber "⚠ Admin <name> duyệt thay" khi override, badge emerald "✓ Đã duyệt", empty "— chưa duyệt" italic gray, footer timestamp signedAt format vi-VN. Workspace mode hint giữ amber "Ý kiến + chữ ký auto đồng bộ khi NV duyệt". Mirror fe-admin + fe-user (rule §3.9). Verify: dotnet build pass + dotnet test 81 pass + npm run build × 2 pass · 0 TS error. Chunk D docs (current) STATUS/HANDOFF/migration-todos/CLAUDE.md/schema-diagram §16 mới + session log. Phiếu V1 cũ KHÔNG migrate (giữ Mig 15 readOnly), drop sau UAT confirm. **Stats:** 26 mig (+1), 59 DB tables (+1), ~141 endpoints (no new), 33 FE pages, 81 test pass. Polish 3 button (873e7a1) Hành động đầu Session 19: rút gọn label "✓ Duyệt / ← Trả lại / ✗ Từ chối" + 3 màu khác nhau (emerald/amber/red) + font-bold cho cả 2 app. | `873e7a1` (3 button) · `77a3058` (Chunk A Mig 26) · `90baa8e` (Chunk B Service+DTO+GET) · `6e913b3` (Chunk C FE) · (current Chunk D Docs) |
diff --git a/docs/changelog/migration-todos.md b/docs/changelog/migration-todos.md
index 9a20a7f..4b50fc1 100644
--- a/docs/changelog/migration-todos.md
+++ b/docs/changelog/migration-todos.md
@@ -157,6 +157,40 @@ Session log: `2026-04-28-chot-session-4-budget.md`.
 
 ## 📝 Phase 9 — UAT + Ops + carry over (Session 6+ active)
 
+### ✅ Session 20 WRAP done (2026-05-11 chốt 22:00) — 14 commit `9dee00d` → `ae1814c`
+
+12 turn 1 ngày — PE UI restructure 3 chủ đề + Mig 27 menu eOffice + Multi-agent setup.
+
+**Session log:** 3 file
+- `2026-05-11-1100-pe-ui-restructure-s20.md` (turns 1-5: PE Detail nested grid + Section gộp)
+- `2026-05-11-1700-menu-visibility-mig27.md` (turn 7: admin menu eOffice Mig 27)
+- `2026-05-11-2200-pe-polish-responsive-multiagent.md` (turns 6 + 8-12: polish + responsive + multi-agent)
+
+**Stats final S20:**
+
+| Metric | Δ | Final |
+|---|---|---|
+| Migrations | +1 (Mig 27) | 27 |
+| Endpoints | +1 (PATCH /menus/{key}) | ~142 |
+| FE pages | +1 (MenuVisibilityPage) | 34 |
+| Menu keys | +1 (MenuVisibility) | ~61 |
+| Memory entries | +2 (responsive + multi-agent) | 16 |
+| Sub-agents | +3 NEW (Inv + Imp + Rev seeds) | 3 |
+| Commits | 14 | (`9dee00d` → `ae1814c`) |
+| DB tables | 0 | 59 |
+| Tests | 0 (Phase 9 UAT defer) | 81 PASS |
+| Gotchas | 0 | 44 |
+| Skills | 0 (reuse trong agents) | 6 |
+
+**Memory entries mới (2):**
+- `feedback_responsive_laptop_breakpoint.md` (t11) — 4-tầng responsive pattern
+- `feedback_multi_agent_setup.md` (t12) — decision gate + ACCEPT/REFUSE + Windows MAX_PATH
+
+**Defer Session 21+ NEW:**
+- [ ] **Trial Week 1 — Contract V2 wire Mig 28+29** (Plan cha B HIGH) — kick off multi-agent với Investigator pre-flight + Implementer Chunk A-E + Reviewer pre-commit. Audit-reuse pattern PE V2 (memory `feedback_audit_reuse_before_clone`).
+- [ ] **Test regression Mig 27 PATCH /menus/{key}** (Plan cha C MED) — validate Key required + DisplayLabel trim
+- [ ] **Skill `permission-matrix`** cross-ref section "menu visibility" — defer cron audit 2026-06-01
+
 ### ✅ Session 20 turn 7 done (2026-05-11) — Admin Ẩn/Hiện + Đổi tên menu eOffice (Mig 27, 5 chunk `2ea2d27` → `ef394f8` → `059bfcb` → `1ed6530` → Chunk E Docs)
 
 User UAT yêu cầu admin quản lý menu eOffice (fe-user) — Ẩn/Hiện + Đổi tên. Confirm "chưa có" → tạo mới. User Q2=b clarify quan trọng: DisplayLabel CHỈ áp fe-user, admin sidebar giữ Label gốc.
diff --git a/docs/changelog/sessions/2026-05-11-2200-pe-polish-responsive-multiagent.md b/docs/changelog/sessions/2026-05-11-2200-pe-polish-responsive-multiagent.md
new file mode 100644
index 0000000..6405286
--- /dev/null
+++ b/docs/changelog/sessions/2026-05-11-2200-pe-polish-responsive-multiagent.md
@@ -0,0 +1,238 @@
+# Session 20 turns 6 + 8-12 — PE polish (NCC palette + autofill + responsive) + Multi-agent setup
+
+**Date:** 2026-05-11 (chiều-tối, sau turn 7 wrap-up 17:00)
+**Commits:** 7 commits từ `f568945` (turn 6) → `ae1814c` (turn 12)
+**Scope:** FE polish UX iteration + infrastructure setup multi-agent
+
+## Tổng quan 7 turn
+
+| Turn | Topic | Commit | Files |
+|---|---|---|---|
+| 6 | Manual budget "Nhập tay" — drop tên field + VND format | `f568945` | 6 (3 fe-admin + 3 fe-user mirror) |
+| 8 | AddSupplier +Số tiền inline + NCC 5-màu palette + Winner 🏆 | `3ec7b5a` | 2 (PE detail mirror) |
+| 9 | Winner revert badge → icon ✓ đậm + hover transition | `83aae8e` | 2 |
+| 10 | AddSupplier auto-fill từ master khi chọn NCC dropdown | `66551db` | 2 |
+| 11 | Responsive cho laptop màn hình nhỏ (sidebar + workspace + padding) | `6e338f7` | 6 (Layout + PE detail + workspace × 2 app) |
+| 12 | Setup multi-agent infrastructure (3 sub-agents) | `ae1814c` | 7 (4 agent .md + 3 MEMORY.md seed) |
+
+(Turn 7 menu visibility Mig 27 đã có session log riêng `2026-05-11-1700-menu-visibility-mig27.md`. Turn 1-5 đã có `2026-05-11-1100-pe-ui-restructure-s20.md`.)
+
+## Turn 6 — Manual budget "Nhập tay" drop tên field (`f568945`)
+
+User screenshot: chế độ "Nhập tay (không link)" Section 2 b. Ngân sách vẫn còn input "Tên (vd Tạm tính T11/2025)" cùng số tiền. User chỉ cần nhập số tiền.
+
+3 file × 2 app = 6 file FE update:
+- `PeDetailTabs.tsx` BudgetFieldRow (Section 2 detail editor)
+- `PeWorkspaceCreateView.tsx` (workspace mode "new")
+- `PeHeaderForm.tsx` (Create/Edit header page)
+
+Mỗi file:
+- Drop Input "Tên ngân sách" UI khỏi manual mode (state field giữ `''` backward compat — BE save luôn `null`)
+- Manual mode UI giờ chỉ 1 input số tiền (`max-w-xs`) + VND format `1.000.000` + suffix `đ` + hint
+- Helpers `parseVnd` + `formatVndInput` inline mỗi file
+
+PeDetailTabs BudgetFieldRow cleanup thêm:
+- Drop state `manualName` + setter
+- Drop `manualName` từ dirty check
+- Save payload: `budgetManualName: null` luôn
+
+Read-only display (legacy data) giữ `ev.budgetManualName` nếu data cũ có tên (không xóa hiển thị, chỉ ẩn input UI).
+
+## Turn 8 — AddSupplier +Số tiền inline + NCC 5-màu palette + Winner 🏆 (`3ec7b5a`)
+
+User 4 yêu cầu UX NCC grid:
+1. Thêm NCC dialog cho nhập luôn Số tiền báo giá cho hạng mục
+2. Số tiền hiện ra cột so sánh hạng mục (đã có sẵn cột "Số tiền")
+3. Trang trí 3+ NCC khác nhau 3+ màu khác nhau
+4. NCC được chọn (winner) nổi bật hơn
+
+### AddSupplierDialog — sequential POST tạo NCC + Quote
+
+- Thêm prop `detailId?: string` (HangMucCard truyền `detail.id`)
+- Form state `+thanhTien: 0`
+- `showQuote = !!detailId` — chỉ render input "Số tiền báo giá" khi gọi từ HangMucCard
+- Mutation 2 step:
+  1. `POST /purchase-evaluations/{id}/suppliers` → response `{id}` (BE controller `Ok(new {id = newId})`)
+  2. Nếu `detailId + thanhTien > 0` → `POST /quotes` với `purchaseEvaluationDetailId + purchaseEvaluationSupplierId (newSupplierRowId) + thanhTien`
+- Toast: "Đã thêm NCC + báo giá" (có quote) hoặc "Đã thêm NCC" (no quote)
+- Section input "Số tiền" trong card `bg-brand-50/40` + VND format + suffix `đ` + hint "Để trống / 0 → chỉ tạo NCC"
+
+### NCC row 5-màu cycle palette + winner badge
+
+```ts
+const NCC_PALETTES = [
+  'border-l-blue-400 bg-blue-50/40',
+  'border-l-purple-400 bg-purple-50/40',
+  'border-l-sky-400 bg-sky-50/40',
+  'border-l-teal-400 bg-teal-50/40',
+  'border-l-pink-400 bg-pink-50/40',
+] as const
+```
+
+Loop `ev.suppliers.map((s, idx) → palette = NCC_PALETTES[idx % 5]`.
+
+Winner override:
+- `border-l-emerald-500` (thay vì palette stripe)
+- `bg-emerald-100/70` (đậm hơn)
+- `font-semibold + shadow-sm`
+- `ring-1 ring-inset ring-emerald-300`
+- Badge inline "🏆 Trúng thầu" rounded-full bg-emerald-600 text-white
+
+## Turn 9 — Winner revert badge → icon ✓ đậm + hover (`83aae8e`)
+
+User feedback: bỏ badge "🏆 Trúng thầu", revert về icon stick ✓ cũ nhưng đậm hơn + hover.
+
+- Bỏ badge rounded-full
+- Restore `<span className="mr-1 text-base font-bold text-emerald-700">✓</span>` prefix
+- Tên NCC winner đậm: `text-emerald-900`
+- Row hover transition:
+  - Winner: `hover:bg-emerald-200/70`
+  - Non-winner palette: `hover:bg-white/80 hover:shadow-sm`
+  - Smooth qua `transition` class
+
+## Turn 10 — AddSupplier auto-fill master khi chọn NCC (`66551db`)
+
+User: chọn NCC từ dropdown master → auto-load các field đã có sẵn (contactPerson/phone/email/note) vào form.
+
+`AddSupplierDialog` dropdown "NCC (master)" onChange:
+```tsx
+onChange={e => {
+  const picked = suppliers.data?.find(s => s.id === e.target.value)
+  setForm(prev => ({
+    ...prev,
+    supplierId: e.target.value,
+    contactName: picked?.contactPerson ?? '',
+    contactPhone: picked?.phone ?? '',
+    contactEmail: picked?.email ?? '',
+    note: picked?.note ?? '',
+  }))
+}}
+```
+
+Hint "✓ Đã tự điền từ Master — bạn có thể sửa lại nếu cần" text-[10px] text-emerald-600.
+
+Mapping master Supplier → PE.Supplier:
+- `contactPerson` → `contactName`
+- `phone` → `contactPhone`
+- `email` → `contactEmail`
+- `note` → `note`
+
+Skip: `displayName / paymentTermText / thanhTien` (manual, không có trong master). Skip `address` (PE.Supplier không có field tương ứng).
+
+## Turn 11 — Responsive laptop màn nhỏ (`6e338f7`)
+
+User: "giao diện hiện tại chưa đáp ứng tốt cho laptop màn hình nhỏ → Căn chỉnh lại nhé."
+
+Memory `feedback_responsive_laptop_breakpoint.md` capture pattern 4 tầng.
+
+4 fix targeted:
+
+| Fix | Trước | Sau | Gain |
+|---|---|---|---|
+| Sidebar (fe-admin + fe-user) | `w-72` (288px) | `w-60 xl:w-72` | +48px lg |
+| PE Workspace 2-panel | `lg:grid-cols-[320px_1fr]` | `lg:[260px_1fr] xl:[320px_1fr]` | +60px lg |
+| Section padding | `px-5 py-4` | `px-3 py-3 sm:px-5 sm:py-4` | +16px xs |
+| HangMucCard padding | `gap-3 p-3` | `flex-wrap gap-2 p-2 sm:gap-3 sm:p-3` | +8px xs |
+
+Net gain trên laptop 1366px: ~+132px width cho NCC table area.
+
+Behavior phân tầng:
+- **<sm** (mobile): tightest padding
+- **lg** 1024-1279px: sidebar 240px + workspace list 260px
+- **xl+** 1280px+: behavior cũ giữ nguyên (sidebar 288, list 320, padding rộng)
+
+KHÔNG đụng dialog widths / semantic breakpoints lớn / `md` `sm` mobile.
+
+## Turn 12 — Multi-agent infrastructure setup (`ae1814c`)
+
+User paste self-contained template từ NAMGROUP s41-s43 trial empirical-grounded. Pre-flight decision gate **6/6 ✅** → proceed setup.
+
+### Pre-flight checklist
+
+| Question | Status |
+|---|---|
+| Codebase > 10K LOC? | ✅ (59 tables · 27 mig · ~142 endpoints · 34 FE pages) |
+| Project > 6 months? | ✅ (roadmap T1-T13) |
+| Heavy multi-file features regular? | ✅ (per-chunk 5-6 commit/session) |
+| User extend "ngáo threshold"? | ✅ (S20 đã 12+ turn deep context) |
+| 25+ accumulated gotchas/patterns? | ✅ (44 gotchas · 14 memory · 6 skills) |
+| Critical changes adversarial review? | ✅ (UAT live 3 prod domain) |
+
+### Setup created
+
+```
+.claude/
+├── agents/                    ← 4 file
+│   ├── README.md              (~9.7KB master coordination guide)
+│   ├── investigator.md        (cyan READ — research + audit + WebFetch)
+│   ├── implementer.md         (yellow WRITE conditional Case 1+2+3+5 only, NO worktree)
+│   └── reviewer.md            (red READ adversarial pre-commit + live curl)
+└── agent-memory/
+    ├── investigator/MEMORY.md (~5.9KB seed)
+    ├── implementer/MEMORY.md  (~6.9KB seed)
+    └── reviewer/MEMORY.md     (~6.5KB seed)
+```
+
+### Customizations SOLUTION_ERP
+
+- Skills preload mỗi agent (reuse 6 skills hiện có):
+  - **Investigator:** `contract-workflow` + `permission-matrix` + `ef-core-migration`
+  - **Implementer:** `ef-core-migration` + `permission-matrix` + `form-engine`
+  - **Reviewer:** `dependency-audit-erp` + `iis-deploy-runbook` + `contract-workflow`
+- DB context: `_Dev` runtime + `_Design` ef tooling distinct
+- Test bearer: `admin@solutions.com.vn` (full) + `nv.test@solutions.com.vn` (Drafter UAT scope)
+- Prod UAT: `api/admin/eoffice.solutions.com.vn`
+
+### Windows MAX_PATH pitfall handled
+
+Project path `D:\Dropbox\CONG_VIEC\SOLUTION\SOLUTION_ERP\` = 51 chars + Dropbox-managed → `isolation: worktree` **DROPPED** khỏi `implementer.md` frontmatter (per template Pitfall 1). Em main reviews diff before commit (compensate).
+
+### Memory baseline seeded
+
+3 MEMORY.md có:
+- Patterns proven cross-session (5-chunk discipline, 3-file Mig rule, audit-reuse clone, service hook derived state, FE mirror 2 app, VND format helpers, responsive 4-tầng)
+- 44 gotcha cross-ref
+- Phase 9 UAT iteration mode (skip test per chunk theo memory `feedback_uat_skip_verify`)
+- 5-category Reviewer checklist tinh chỉnh theo SOLUTION_ERP gotcha cluster
+- Tests baseline 81/81 PASS preserve
+
+### Trial workflow
+
+- **Week 1 candidate:** Contract V2 wire (Mig 28+29) mirror PE pattern S17-S19 — pattern proven 1× audit-reuse. ~600+ LOC, 2 mig + Service + Controller + FE × 2 app.
+- **Week 2-3:** Feature wire (Solo em + Inv pre-flight + Rev pre-commit) — phân quyền strict V2 + drop legacy V1.
+- **Week 4:** Evaluate quality vs cost real numbers.
+  - Pass criteria: Rev catch ≥ 2 wire bugs trước commit + time saving ≥ 25% Case 1+2 + Max 20× quota comfortable
+  - Fail: rollback solo, agents archived
+
+### Agent state (chốt session)
+
+3 sub-agents **vừa setup** ở turn 12 — chưa spawn work nào. MEMORY.md seeds-only state. KHÔNG có findings để flush cross-agent learnings ở session này. Trial Week 1 sẽ kick off ở Session 21 với Contract V2 candidate.
+
+## Stats cumulative Session 20 (turns 1-12)
+
+| Metric | Trước S20 | Sau S20 turn 12 | Delta |
+|---|---|---|---|
+| DB tables | 59 | 59 | 0 |
+| Migrations | 26 | **27** | +1 (Mig 27 menu visibility) |
+| Endpoints | ~141 | **~142** | +1 (PATCH `/menus/{key}`) |
+| FE pages | 33 | **34** | +1 (MenuVisibilityPage) |
+| Menu keys | ~60 | **~61** | +1 (MenuVisibility) |
+| Unit tests | 81 | 81 | 0 (Phase 9 UAT defer) |
+| Gotchas | 44 | 44 | 0 |
+| Memory entries | 14 | **16** | +2 (responsive + multi-agent) |
+| Skills | 6 | 6 | 0 (no new — chỉ reuse trong agents) |
+| Sub-agents | 0 | **3** | +3 (Investigator + Implementer + Reviewer) |
+| Total commits S20 | — | **14** | (`9dee00d` → `ae1814c`) |
+
+## Memory entries mới (S20)
+
+1. **`feedback_responsive_laptop_breakpoint.md`** (turn 11) — 4-tầng pattern: sidebar w-60 xl:w-72 + workspace 2-panel lg:260 xl:320 + Section padding xs/sm responsive + Card flex-wrap. Decision: phân biệt rõ `lg` vs `xl` cho laptop nhỏ vs desktop.
+2. **`feedback_multi_agent_setup.md`** (turn 12) — Decision gate 6-criteria. Anthropic + Cognition hybrid. Implementer ACCEPT/REFUSE strict rules. Windows MAX_PATH pitfall. NAMGROUP s41-s43 ROI curve reference.
+
+## Cross-ref
+
+- Session log turn 1-5: `2026-05-11-1100-pe-ui-restructure-s20.md`
+- Session log turn 7: `2026-05-11-1700-menu-visibility-mig27.md`
+- Memory `feedback_per_chunk_commit.md` — applied turn 7 Chunk A-E discipline (Mig 27)
+- Memory `feedback_uat_skip_verify.md` — Phase 9 active, skip dotnet test mỗi chunk
+- `.claude/agents/README.md` — master coordination guide chi tiết