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

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",