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/notifiers/telegram_stock.py

@@ -2,6 +2,8 @@
 import logging
 from typing import Any, Dict
 
+from ..telegram.messaging import send_raw
+
 logger = logging.getLogger("agent-office")
 
 _ACTION_KR = {"add": "🟢 추가매수", "hold": "⚪ 보유", "trim": "🟡 축소", "sell": "🔴 매도"}
@@ -33,7 +35,6 @@ def format_holdings_brief(payload: Dict[str, Any]) -> str:
 
 
 async def send_holdings_brief(payload: Dict[str, Any]) -> None:
-    from ..telegram.messaging import send_raw
     text = format_holdings_brief(payload)
     try:
         await send_raw(text)