fix(governance): keep trust drift watchdog on governance agent

apps/api/src/jobs/ai_slo_watchdog_job.py

@@ -204,17 +204,18 @@ async def _check_once() -> None:
 
     # W-6: Trust Drift 偵測（Playbook 信任度漂移）
     # 2026-05-02 ogt + Claude Sonnet 4.6（亞太）: 整併雙寫路徑
-    # 2026-05-04 ogt + Claude: 修復重複告警 — 改為直接用 trust_drift_detector 純統計
-    #   背景：原本呼叫 governance_agent.check_trust_drift() 會觸發 Telegram 告警
-    #   但 governance_agent.run_self_check() 每 1h 也會呼叫同一方法 → 雙重 Telegram
-    #   修正：watchdog 只取統計數字，不觸發 Telegram；告警由 governance_agent 獨家負責
+    # 2026-05-05 Codex: Watchdog 仍透過 governance_agent 單一入口，
+    # 但用 emit_alert=False 只取統計，避免與 hourly self-check 發出雙重 Telegram。
     try:
-        from src.services.trust_drift_detector import get_trust_drift_detector
-        dist = await get_trust_drift_detector().detect()
-        if dist.drift_detected:
+        from src.services.governance_agent import get_governance_agent
+        trust_result = await get_governance_agent().check_trust_drift(emit_alert=False)
+        drifted = trust_result.get("drifted", 0)
+        if drifted > 0:
+            auto_deprecated = trust_result.get("auto_deprecated", 0)
+            kept = trust_result.get("kept", 0)
             violations.append(
-                f"Trust Drift 偵測到 {dist.low_count} 個 Playbook 信任度低落"
-                f"（low_ratio: {dist.low_ratio:.1%}，mean_trust: {dist.mean_trust:.2f}）"
+                f"Trust Drift 偵測到 {drifted} 個 Playbook 信任度低落"
+                f"（auto-deprecated: {auto_deprecated}，待人工審核: {kept}）"
             )
             # 2026-05-05 ogt W6 修復：移除動態 low_count，避免 count 微變繞過 dedup
             violation_codes.append("W6:trust_drift")
@@ -247,7 +248,7 @@ async def _check_once() -> None:
     system_impact = "\n".join(
         [
             f"檢出 {len(violations)} 項 KPI 異常（W-1~W-6）",
-            f"關鍵影響：飛輪自動化能力可能降級",
+            "關鍵影響：飛輪自動化能力可能降級",
             *violation_lines,
         ]
     )

apps/api/src/services/governance_agent.py

@@ -72,13 +72,15 @@ class GovernanceAgent:
     # 1. Playbook 信任度漂移
     # =========================================================================
 
-    async def check_trust_drift(self) -> dict[str, Any]:
+    async def check_trust_drift(self, emit_alert: bool = True) -> dict[str, Any]:
         """Playbook trust_score < 0.2 → 告警建議廢棄；30 天沒用過的直接 auto-deprecate
 
         2026-04-26 P2.2 by Claude
         2026-05-02 ogt + Claude Sonnet 4.6: 加 auto_deprecate_low_trust_unused 自治路徑
         守衛條件：trust < 0.2 AND (last_used_at < 30 天前 OR 從未使用且創建超過 30 天)
         → status 改 'deprecated'，alert 改報「N 個告警 + M 個 auto-deprecated」
+        2026-05-05 Codex: emit_alert=False 供 W-6 watchdog 查詢統計，維持
+        governance_agent 單一入口，但避免與 hourly self-check 發出雙重 Telegram。
         """
         async with get_db_context() as db:
             result = await db.execute(
@@ -118,7 +120,7 @@ class GovernanceAgent:
                     ids=auto_deprecated_ids[:10],
                 )
 
-        if drifted:
+        if drifted and emit_alert:
             drift_ratio = len(drifted) / total if total > 0 else 0.0
             await self._alert(
                 "trust_drift",