feat(adr-081): Phase 1 感官縱深 — 8D 情報蒐集 + 執行後驗證

成品：
- IncidentEvidence DB model（8D 感官 + pre/post 執行狀態）
- EvidenceSnapshot dataclass（build_summary → LLM 上下文）
- SanitizationService（Prompt Injection 0-tolerance，12 pattern）
- MCPToolRegistry（動態工具登記，suggest_tools 不寫死告警類型）
- PreDecisionInvestigator（8D 並行感官，P99 < 8s，Redis 30s 快取）
- PostExecutionVerifier（warmup 10s → 後狀態評估 success/degraded/failed）
- decision_manager + approval_execution 接線（feature flag 守衛）

Gate 1 修復：D4/D5/D7/D8 補 sanitize_dict_values；移除裸 "error" failure
signal 防 error_rate key 誤判；evidence_snapshot rowcount 零行警告。

測試：130 passed（+111 新增）

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/api/src/services/approval_execution.py

@@ -270,6 +270,17 @@ class ApprovalExecutionService:
                 )
             )
 
+            # ADR-081 Phase 1: 執行後驗證 (fire-and-forget)
+            # PostExecutionVerifier 等待 K8s 收斂後抓取後狀態，補填 EvidenceSnapshot
+            from src.core.feature_flags import aiops_flags
+            if aiops_flags.is_sub_flag_enabled("AIOPS_P1_POST_EXECUTION_VERIFIER"):
+                asyncio.create_task(
+                    self._run_post_execution_verify(
+                        approval=approval,
+                        action_taken=f"{operation_type.value}:{resource_name}",
+                    )
+                )
+
             # 2026-04-07 Claude Code: Sprint 4 B3 — 記錄人工批准處置類型
             try:
                 anomaly_key = await self._get_anomaly_key_from_approval(approval)
@@ -487,6 +498,63 @@ class ApprovalExecutionService:
             self._write_execution_result_to_km(approval, success, error_message)
         )
 
+    async def _run_post_execution_verify(
+        self,
+        approval: "ApprovalRequest",
+        action_taken: str,
+    ) -> None:
+        """
+        ADR-081 Phase 1: 執行後驗證 (fire-and-forget 包裝)
+
+        1. 從 incident_id 查 Incident
+        2. 從 incident_evidence 取最新 EvidenceSnapshot
+        3. 呼叫 PostExecutionVerifier.verify() 補填後狀態 + 驗證結果
+        4. 結果傳給 learning_service 更新 Playbook trust_score（Phase 3）
+        """
+        if not approval.incident_id:
+            return
+
+        try:
+            from src.services.incident_service import get_incident_service
+            from src.services.post_execution_verifier import get_post_execution_verifier
+            from src.services.evidence_snapshot import EvidenceSnapshot
+
+            incident_svc = get_incident_service()
+            incident = await incident_svc.get_incident(approval.incident_id)
+            if incident is None:
+                logger.warning(
+                    "post_verify_incident_not_found",
+                    approval_id=str(approval.id),
+                    incident_id=approval.incident_id,
+                )
+                return
+
+            # 取最新 EvidenceSnapshot（若 Phase 1 flag 有啟動才會有）
+            snapshot = await EvidenceSnapshot.get_latest_snapshot(approval.incident_id)
+
+            verifier = get_post_execution_verifier()
+            verification_result = await verifier.verify(
+                incident=incident,
+                snapshot=snapshot,
+                action_taken=action_taken,
+            )
+
+            logger.info(
+                "post_verify_complete",
+                approval_id=str(approval.id),
+                incident_id=approval.incident_id,
+                result=verification_result,
+                action=action_taken,
+            )
+
+        except Exception as _e:
+            # 驗證失敗不影響執行結果
+            logger.warning(
+                "post_verify_failed",
+                approval_id=str(approval.id),
+                error=str(_e),
+            )
+
     async def _write_execution_result_to_km(
         self,
         approval: "ApprovalRequest",