refactor(agent-office/base): transition의 State 자동 로그 제거

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

agent-office/app/agents/base.py

@@ -1,8 +1,6 @@
 import time
 from typing import Optional
 
-from ..db import add_log
-
 VALID_STATES = ("idle", "working", "waiting", "reporting")
 
 class BaseAgent:
@@ -29,8 +27,6 @@ class BaseAgent:
         if new_state == "idle":
             self._idle_since = time.time()
 
-        add_log(self.agent_id, f"State: {old} -> {new_state} ({detail})")
-
         if self._ws_manager:
             await self._ws_manager.send_agent_state(self.agent_id, new_state, detail, task_id)
             if new_state == "working" and old != "working":