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Wave 8 P3.1-T2 PathA 啟用 + Solver F4 安全強化 + test 對齊：
PathA — DiagnosisAggregator 信號分類層補 PDI:
- ENABLE_DIAGNOSIS_AGGREGATOR default=False → True
· PathA 純信號分類層（OOMKilled/CrashLoop 等業務邏輯）
· 不重複呼叫 K8s/SignOz API（只取 PDI 已收集的 raw 資料）
· 安全 default on — 純邏輯處理，無外部依賴重疊
- diagnosis_aggregator.py +155 行（PathA 實作）
- pre_decision_investigator.py 已接 (commit 3a2cd151)
F4 — Solver critical risk reject:
- solver_agent.py: _validate_recommended_action 拒絕 risk=critical
· 鐵律：critical 動作必須走人工審批，不可變 Telegram 按鈕
· log warning + return None（被 _extract 過濾掉）
- _extract_recommended_actions 改返回 (list, status_str) tuple
· status="ok"/"empty"/"all_invalid" 供呼叫端決策
- protocol.py +16 / metrics.py +9 / ai_router.py +18 — 配套 metric + protocol field
測試對齊:
- test_solver_recommended_actions.py 拆 test_all_valid → low/medium/high accepted +
test_critical_rejected
- result tuple unpack: result, _ = _extract_recommended_actions(...)
- test_diagnosis_aggregator_stub.py: feature flag default 改 True 對齊 PathA
Tests: 51 passed (solver 28 + aggregator 16 + router fallback 8)
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Co-Authored-By: Multiple Engineers (Wave 8 P3.1-T2 PathA + F4) <noreply@anthropic.com>