chore: log to stdout on message buffer autoclear step (#1413)

letta/agent.py

@@ -760,6 +760,7 @@ class Agent(BaseAgent):
                 break
 
         if self.agent_state.message_buffer_autoclear:
+            self.logger.info("Autoclearing message buffer")
             self.agent_state = self.agent_manager.trim_all_in_context_messages_except_system(self.agent_state.id, actor=self.user)
 
         return LettaUsageStatistics(**total_usage.model_dump(), step_count=step_count, steps_messages=steps_messages)