fix(google-chat): don't flip clarify to text-capture at send time

mark_awaiting_text is the 'Other (type answer)' mode-flip, not a send-time
setup call — invoking it in send_clarify forces the user's next message to
be captured as the clarify response, racing the button-click path and
bypassing the buttons entirely. Telegram calls it only in the 'other'
callback branch; do the same here.

plugins/platforms/google_chat/adapter.py

@@ -2103,12 +2103,6 @@ class GoogleChatAdapter(BasePlatformAdapter):
         result = await self.send_card(chat_id, card, metadata=metadata)
         if result.success:
             self._clarify_state[clarify_id] = session_key
-            try:
-                from tools.clarify_gateway import mark_awaiting_text
-
-                mark_awaiting_text(clarify_id)
-            except Exception as exc:
-                logger.warning("[GoogleChat] mark_awaiting_text failed: %s", exc)
             return result
         return await super().send_clarify(
             chat_id, question, choices, clarify_id, session_key, metadata