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feat(Phase 3): 學習閉環重建 — 三根因修復 + 2x EWMA + Evolver Agent
ADR-083 Phase 3 學習閉環重建:

**三根因修復**
- approval_execution.py: fire-and-forget create_task → await asyncio.wait_for(timeout=30) × 2
  (成功路徑 L265 + 失敗路徑 L353,超時記錄 learning_trigger_timeout metric,主流程不 crash)
- models/approval.py: ApprovalRequestBase 新增 matched_playbook_id 欄位
- decision_manager.py: _auto_execute 建立 ApprovalRequest 時填充 matched_playbook_id
- learning_service.py: 雙路徑查找 _matched_pb_id(matched_playbook_id + metadata fallback)

**2x EWMA 負向強化**
- models/playbook.py: 新增 trust_score: float = 0.3(EWMA 動態信任度欄位)
- repositories/playbook_repository.py: update_stats 加 EWMA
  成功: trust = 0.9 × old + 0.1 × 1.0
  失敗: trust = 0.8 × old + 0.2 × 0.0(衰減速度 2x)
  trust < 0.1 → log warning,等 Evolver 封存

**Evolver Agent(新建)**
- services/playbook_evolver.py: 三功能全靜態規則
  1. 低信任封存: trust < 0.1 → DEPRECATED
  2. 休眠封存: 30d 未使用 AND trust < 0.5 → DEPRECATED
  3. 相似合併: 症狀 Jaccard > 0.9 → 保留高 trust,封存低 trust
  AIOPS_P3_EVOLVER_ENABLED=False 預設關閉

**文件**
- ADR-083 學習閉環重建
- MASTER §8 Phase 3 完工記錄

AIOPS_P3_ENABLED=False(預設),骨架就位等統帥批准開啟

Co-Authored-By: Claude Sonnet 4.6(亞太)<noreply@anthropic.com>
2026-04-15 14:01:37 +08:00
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