df0b9f76 regressed look_at from synchronous prompt (session.prompt) to
async prompt (session.promptAsync) + pollSessionUntilIdle polling. This
introduced a race condition where the poller fires before the server
registers the session as busy, causing it to return immediately with no
messages available.
Fix: restore promptSyncWithModelSuggestionRetry (blocking HTTP call) and
remove polling entirely. Catch prompt errors gracefully and still attempt
to fetch messages, since session.prompt may throw even on success.
13d960f3ca