fix(agent-office): EOD 16:50 stagger(부분일봉 방지)·idle가드 문서화·proxy/import 정리

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

agent-office/app/service_proxy.py

@@ -100,8 +100,8 @@ async def stock_holdings_run() -> Dict[str, Any]:
             f"{STOCK_URL}/api/stock/holdings/intel/run",
             params={"use_llm": True},
         )
-    resp.raise_for_status()
-    return resp.json()
+        resp.raise_for_status()
+        return resp.json()
 
 
 async def stock_holdings_brief() -> Dict[str, Any]:
@@ -110,6 +110,7 @@ async def stock_holdings_brief() -> Dict[str, Any]:
     resp.raise_for_status()
     return resp.json()
 
+
 async def generate_music(payload: dict) -> Dict[str, Any]:
     resp = await _client.post(f"{MUSIC_LAB_URL}/api/music/generate", json=payload)
     resp.raise_for_status()