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+## 2026-05-24｜T159 KM stale owner-review burn-down dashboard
+
+**觸發**：
+
+- T158 已把 pending owner-review dispatch 顯示成工作台，但 operator 還需要直接看 stale ratio 是否因 owner-approved completion 而下降。
+- 使用者要求前端要能呈現「已完成 / 正在推進 / 卡在哪個階段」，不能只靠 Telegram 或單筆按鈕回覆。
+- 本階段目標是把 owner-review、completion audit、stale ratio recheck 與剩餘門檻差距集中成 read-only burn-down 面板。
+
+**修正**：
+
+- 新增 `GET /api/v1/ai/governance/km-stale-owner-review-burndown`：
+  - schema `km_stale_owner_review_burndown_v1`。
+  - 回傳 current stale ratio snapshot、距離 20% 門檻仍需處理幾筆、pending/completed owner review、completion audit/recheck 總數。
+  - 回傳最近 owner-approved completion trail，包含 source dispatch、recheck dispatch、workflow stage、review outcome、stale count/ratio delta。
+  - read-only：`writes_on_read=false`、`manual_review_required=true`。
+- AwoooP Work Items / AI 治理新增 `Stale ratio burn-down` 面板：
+  - 顯示目前陳舊比例、陳舊/總數、待審/完成、最新 delta。
+  - 顯示 completion audit / recheck count 與 guardrail。
+  - 顯示最近 completion trail，和 T158 Owner review 工作台放在同一個治理區塊。
+- `km_stale_ratio_recheck` context 補上 `project_id`，讓後續 burn-down 與多租戶查詢能穩定對齊。
+
+**local verification**：
+
+```text
+python3 -m py_compile apps/api/src/models/governance.py apps/api/src/services/governance_km_stale_review_service.py apps/api/src/api/v1/ai_governance.py apps/api/tests/test_ai_governance_endpoints.py -> OK
+/Users/ogt/.pyenv/shims/ruff check apps/api/src/models/governance.py apps/api/src/services/governance_km_stale_review_service.py apps/api/src/api/v1/ai_governance.py apps/api/tests/test_ai_governance_endpoints.py -> OK
+DATABASE_URL='postgresql+asyncpg://test:test@localhost/test' /Users/ogt/.pyenv/shims/pytest apps/api/tests/test_ai_governance_endpoints.py apps/api/tests/test_governance_agent.py apps/api/tests/test_hermes_kb_growth_worker.py apps/api/tests/test_governance_dispatcher.py -q
+  -> 105 passed
+pnpm --filter @awoooi/web exec tsc --noEmit --incremental false -> OK
+pnpm --dir apps/web exec next lint --file src/app/[locale]/awooop/work-items/page.tsx -> OK
+json parse apps/web/messages/zh-TW.json apps/web/messages/en.json -> OK
+git diff --check -> OK
+```
+
+**production deploy / smoke**：
+
+```text
+code commit:
+ded2223d feat(governance): surface stale km burndown
+
+deploy marker:
+a68bc7f0 chore(cd): deploy ded2223 [skip ci]
+
+Gitea Actions:
+2993 CD -> success
+  tests 3939 -> success
+  build-and-deploy 3940 -> success
+  post-deploy-checks 3941 -> success
+2994 AI Code Review -> success
+2995 Type Sync Check -> success
+
+K8s:
+awoooi-api    image=.../api:ded2223d14c184f7fc6b9edd078cb1adce23aed9 ready=2/2
+awoooi-web    image=.../web:ded2223d14c184f7fc6b9edd078cb1adce23aed9 ready=2/2
+awoooi-worker image=.../api:ded2223d14c184f7fc6b9edd078cb1adce23aed9 ready=1/1
+
+burn-down API:
+schema_version=km_stale_owner_review_burndown_v1
+project_id=awoooi
+burn_down_status=above_threshold
+current_snapshot=1491/3027 ratio=0.493 threshold=0.2 stale_days=7
+entries_to_threshold=886
+pending_owner_reviews=10
+completed_owner_reviews=1
+completion_audit_total=1
+stale_ratio_recheck_total=1
+writes_on_read=false
+manual_review_required=true
+latest completion:
+  audit=c0a62d49-448b-4223-ae80-1abb6e361260
+  entry=01951ae2-87e3-46ce-afb6-e7e7e1fb16ba
+  stage=km_writeback_after_approval
+  outcome=refresh_with_evidence
+  recheck=a2a7f76f-e257-41ee-bd94-186c42975a40
+
+frontend:
+GET /zh-TW/awooop/work-items?project_id=awoooi -> 200
+Browser smoke:
+  hasCriticalError=false
+  hasAwoooP=true
+  hasNav=true
+  hasBurnDown=true
+  hasRemaining=true
+  hasOwnerReviewInbox=true
+  screenshot=/tmp/t159-work-items-burndown-visible.png
+```
+
+**處置判讀**：
+
+- T159 讓 KM governance 的「數據是否真的下降」從隱藏在 completion 回覆，升級成 operator console 的常駐 burn-down read model。
+- 目前 production 仍高於 20% 門檻：1491/3027 = 49.3%，距離門檻約 886 筆；所以 knowledge_degradation 告警不應關閉。
+- 下一段應做 T160：owner review completion 的批次輔助與 stale ratio burn-down 篩選，讓已審核項目能更快完成並把 pending/completed/failed 分流清楚。
+
+**目前整體進度**：
+
+- AwoooP 告警可觀測鏈：約 98.5%。
+- 治理告警可讀性 / 可處置性：約 97.5%。
+- KM stale governance 自動化：約 95.5%。
+- Frontend AI 自動化管理介面同步：約 98.5%。
+- Runtime rollout 穩定性：約 97.5%。
+- 完整 AI 自動化管理產品化：約 96.5%。
+
 ## 2026-05-24｜T158 KM stale owner-review inbox / per-item completion surface
 
 **觸發**：