feat: capture message_thread_id for Telegram topic routing

src/runtime-1/channels/telegram.py

@@ -7,8 +7,9 @@ import boto3
 class TelegramAdapter:
     """Channel adapter for Telegram Bot API."""
 
-    def __init__(self, chat_id: str, bot_token_secret_arn: str = ''):
+    def __init__(self, chat_id: str, bot_token_secret_arn: str = '', message_thread_id: int | None = None):
         self.chat_id = str(chat_id)
+        self.thread_id = message_thread_id  # None for regular chats, int for supergroup topics
         self._secret_arn = bot_token_secret_arn
         self._token: str | None = None
         self._lock = threading.Lock()
@@ -36,31 +37,37 @@ class TelegramAdapter:
 
     def send(self, text: str) -> str:
         """Send message, return message_id."""
-        resp = self._api('sendMessage', {
+        payload: dict = {
             'chat_id': self.chat_id,
             'text': text,
             'parse_mode': 'Markdown',
-        })
+        }
+        if self.thread_id is not None:
+            payload['message_thread_id'] = self.thread_id
+        resp = self._api('sendMessage', payload)
         return str(resp.get('result', {}).get('message_id', ''))
 
     def send_typing(self) -> None:
         """Send typing action (best-effort)."""
         try:
-            self._api('sendChatAction', {
-                'chat_id': self.chat_id,
-                'action': 'typing',
-            })
+            payload: dict = {'chat_id': self.chat_id, 'action': 'typing'}
+            if self.thread_id is not None:
+                payload['message_thread_id'] = self.thread_id
+            self._api('sendChatAction', payload)
         except Exception:
             pass
 
     def edit(self, message_id: str, text: str) -> None:
         """Edit an existing message in-place."""
         try:
-            self._api('editMessageText', {
+            payload: dict = {
                 'chat_id': self.chat_id,
                 'message_id': int(message_id),
                 'text': text,
                 'parse_mode': 'Markdown',
-            })
+            }
+            if self.thread_id is not None:
+                payload['message_thread_id'] = self.thread_id
+            self._api('editMessageText', payload)
         except Exception:
             pass

src/runtime-1/main.py

@@ -64,6 +64,7 @@ def main(payload: dict, context) -> dict:
         adapter = TelegramAdapter(
             chat_id=adapter_config.get('target_id', ''),
             bot_token_secret_arn=adapter_config.get('bot_token_secret_arn', ''),
+            message_thread_id=adapter_config.get('message_thread_id'),
         )
     else:
         # Future channels: instantiate appropriate adapter