Stop truncating long Telegram replies in format_response (#172)

format_response() truncated any text over MAX_MSG_LEN and appended a
"... (truncated)" marker. But send() already splits outgoing text into
MAX_MSG_LEN-sized chunks delivered as sequential messages, so truncating
first permanently dropped the tail of long replies.

Return the text unchanged and let send() handle chunking.

Author: serxa

nerve/channels/telegram.py

@@ -571,9 +571,13 @@ async def send(self, message: OutboundMessage) -> None:
             self._cache_message(sent.message_id, chat_id, chunk)
 
     def format_response(self, text: str) -> str:
-        """Truncate for Telegram if needed."""
-        if len(text) > MAX_MSG_LEN:
-            return text[:MAX_MSG_LEN - 20] + "\n\n... (truncated)"
+        """Return text unchanged.
+
+        Long messages must NOT be truncated here: send() already splits text into
+        MAX_MSG_LEN-sized chunks and delivers them as sequential messages. Truncating
+        first (the old behaviour) defeated that chunking and dropped the tail of long
+        replies with a "... (truncated)" marker.
+        """
         return text
 
     # ------------------------------------------------------------------ #