feat：截断过早的超长消息，防止神秘破限词

src/heart_flow/observation.py

@@ -35,6 +35,7 @@ class ChattingObservation(Observation):
 
         self.talking_message = []
         self.talking_message_str = ""
+        self.talking_message_str_truncate = ""
 
         self.name = global_config.BOT_NICKNAME
         self.nick_name = global_config.BOT_ALIAS_NAMES
@@ -145,6 +146,12 @@ class ChattingObservation(Observation):
             timestamp_mode="normal",
             read_mark=last_obs_time_mark,
         )
+        self.talking_message_str_truncate = await build_readable_messages(
+            messages=self.talking_message,
+            timestamp_mode="normal",
+            read_mark=last_obs_time_mark,
+            truncate=True,
+        )
 
         logger.trace(
             f"Chat {self.chat_id} - 压缩早期记忆：{self.mid_memory_info}\n现在聊天内容：{self.talking_message_str}"