fix(agent-office): 일요 회고 견고화 (dead import 제거·send 가드·부분 payload 방어)

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

agent-office/app/agents/lotto.py

@@ -159,7 +159,7 @@ class LottoAgent(BaseAgent):
 
     async def run_sunday_review(self) -> dict:
         """일 09:00 — 최신 회차 forward+calibration 보장 후 회고 텔레그램."""
-        from ..service_proxy import lotto_latest_draw, lotto_backtest_review, lotto_backtest_run_forward
+        from ..service_proxy import lotto_latest_draw, lotto_backtest_review
         from ..notifiers.telegram_lotto import send_sunday_review
         from ..db import create_task, update_task_status, add_log