fix: improve telegram topic mode setup

gateway/platforms/telegram.py

@@ -688,6 +688,29 @@ class TelegramAdapter(BasePlatformAdapter):
                 )
             return None
 
+    async def rename_dm_topic(
+        self,
+        chat_id: int,
+        thread_id: int,
+        name: str,
+    ) -> None:
+        """Rename a forum topic in a private (DM) chat."""
+        if not self._bot:
+            return
+        try:
+            chat_id_arg = int(chat_id)
+        except (TypeError, ValueError):
+            chat_id_arg = chat_id
+        await self._bot.edit_forum_topic(
+            chat_id=chat_id_arg,
+            message_thread_id=int(thread_id),
+            name=name,
+        )
+        logger.info(
+            "[%s] Renamed DM topic in chat %s thread_id=%s -> '%s'",
+            self.name, chat_id, thread_id, name,
+        )
+
     def _persist_dm_topic_thread_id(self, chat_id: int, topic_name: str, thread_id: int) -> None:
         """Save a newly created thread_id back into config.yaml so it persists across restarts."""
         try: