fix(observability): P0 假警報止血 + ConfigMap drift 對齊 + 治理工具

12-Agent 全景診斷觸發的 P0/P1 觀測層修復。

## P0 假警報止血（4 SLO 雪崩根因）
- governance_agent.py:306 — 空 result 不再 fallback 0.0，改 continue + log warning
  根因：Prometheus 查無資料（emitter 未實作 / rule 未部署）被誤判為 SLO=0
  必觸發 violated=True 噴 4 條假告警

## P0 鬼魂按鈕守門
- telegram_gateway.py:1654 — LLM 動態按鈕 Redis 失敗時 btn_list.clear()
  first_row（批准/拒絕，HMAC nonce 無狀態）由 caller 1488 永遠保留
  feedback_no_ghost_buttons.md 三缺一鐵律對齊

## ConfigMap drift 修復（3 處）
- config.py:683 PROMETHEUS_URL: 188→110（drift checker 揪出 = SPF-4 部分根因）
- config.py:705 ARGOCD_URL: 125→121（T0 G3 已知）
- config.py:375 AI_FALLBACK_ORDER: 補 nvidia 對齊 ConfigMap

## P1 Alertmanager 升級（amtool SUCCESS）
- ops/alertmanager/alertmanager.yml: deprecated → v0.27+ 新語法
  - match/match_re → matchers
  - source_match/target_match → source_matchers/target_matchers
  - group_by 加 team label（防 SLO 雪崩 4 條同秒推）
  - PostgreSQL/Redis inhibit 補 equal: ['instance']（防爆炸抑制）
- 新增 3 組因果抑制：
  - OllamaInstanceDown → SLO_*/AI_*（30 分鐘）
  - KMConverterDown → SLO_KMGrowthRate*
  - SLO_*_FastBurn → SLO_*_(Medium|Slow)Burn

## 治理工具落地
- scripts/check_config_drift.py: ConfigMap vs code default drift 檢測
  揪出 PROMETHEUS_URL drift 是 SPF-4 根因（governance_agent 連 188 而非 110）
- scripts/health_check_session.sh: 11 服務 + 4 SSH + drift + git 全景驗證

## 驗證
- 1552 unit tests 全綠
- amtool check-config SUCCESS（8 inhibit_rules / 2 receivers）
- drift checker 4 欄位全對齊
- health check 11 服務全可達

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/api/src/core/config.py

@@ -62,6 +62,21 @@ class Settings(BaseSettings):
         description="Phase 24: True=新 AIRouter 路由, False=舊 openclaw.py fallback chain",
     )
 
+    # ==========================================================================
+    # P1-1: KMWriter 統一契約 (2026-04-28 ogt + Claude Sonnet 4.6)
+    # KM_WRITE_AWAIT=true  → 強制 await asyncio.wait_for(timeout=KM_WRITE_TIMEOUT_SECONDS)
+    # KM_WRITE_AWAIT=false → 舊 fire-and-forget 行為（回滾用）
+    # 回滾指令: kubectl set env deployment/awoooi-api KM_WRITE_AWAIT=false
+    # ==========================================================================
+    KM_WRITE_AWAIT: bool = Field(
+        default=True,
+        description="P1-1: True=強制 await KM 寫入（可靠）, False=fire-and-forget（舊行為，回滾用）",
+    )
+    KM_WRITE_TIMEOUT_SECONDS: float = Field(
+        default=5.0,
+        description="P1-1: KMWriter await timeout（秒），超時記錄 warning 但不阻塞主流程",
+    )
+
     # ==========================================================================
     # aider-watch v2 integration (2026-04-20 ADR-091)
     # 整合 Mac aider CLI 監控進 awoooi 飛輪（events → incident → ai_router feedback）
@@ -354,11 +369,13 @@ class Settings(BaseSettings):
 
     # ==========================================================================
     # AI Fallback Strategy (ADR-006 v1.3 + ADR-036)
-    # Order: Ollama (local) -> Gemini (cloud) -> Claude (cloud)
+    # Order: Ollama (local) -> NVIDIA NIM -> Gemini (cloud) -> Claude (cloud)
     # Tool Calling: Nemotron (專用) -> Gemini -> Claude
+    # 2026-04-28 ogt + Claude Opus 4.7: 補 nvidia 對齊 ConfigMap (k8s/awoooi-prod/04-configmap.yaml)
+    # 之前 default 缺 nvidia 與 ConfigMap drift，feedback_ai_fallback_order.md 鐵律
     # ==========================================================================
     AI_FALLBACK_ORDER: list[str] = Field(
-        default=["ollama", "gemini", "claude"],
+        default=["ollama", "nvidia", "gemini", "claude"],
         description="AI provider fallback order",
     )
     GEMINI_API_KEY: str = Field(default="", description="Google Gemini API key")
@@ -663,9 +680,12 @@ class Settings(BaseSettings):
     # ==========================================================================
     # MCP Phase 2b: Prometheus MCP Server (ADR-071, 2026-04-11 Claude Sonnet 4.6)
     # ==========================================================================
+    # 2026-04-29 ogt + Claude Opus 4.7: drift fix — 188 是 Ollama Hub，Prometheus 實際在 110
+    # ConfigMap 04-configmap.yaml 也是 110；governance_agent / SLO check 連 188 會 timeout
+    # 此 drift 是 SPF-4 (governance_agent silently fail) 根因之一
     PROMETHEUS_URL: str = Field(
-        default="http://192.168.0.188:9090",
-        description="Prometheus server URL",
+        default="http://192.168.0.110:9090",
+        description="Prometheus server URL (DevOps 金庫主機)",
     )
     PROMETHEUS_MCP_ENABLED: bool = Field(
         default=True,
@@ -685,8 +705,10 @@ class Settings(BaseSettings):
 
     # MCP Phase 3: ArgoCD MCP Server (2026-04-11 Claude Sonnet 4.6)
     # ==========================================================================
+    # 2026-04-29 ogt + Claude Opus 4.7: drift fix — ArgoCD 實際在 121，125 是舊位置
+    # ConfigMap 04-configmap.yaml 已寫 121；T0 G3 drift 已知，此次正式對齊
     ARGOCD_URL: str = Field(
-        default="https://192.168.0.125:30443",
+        default="https://192.168.0.121:30443",
         description="ArgoCD API Server URL（K3s NodePort HTTPS）",
     )
     ARGOCD_API_TOKEN: str = Field(