9b8da52f41
_fetch_new_messages() wrapped the whole IMAP connect/login/select/search/ fetch sequence in a bare except that logged and returned an empty list — indistinguishable from a genuinely empty inbox. The adapter never invoked its fatal-error handler, so the gateway's reconnect/backoff/status machinery never learned the mailbox was unreachable; outages lasted until a manual restart. Track fetch failure on the adapter and, when the poll loop observes it, set a retryable fatal error (email_imap_fetch_failed) and notify the gateway handler so the platform enters the reconnect queue just like a startup connection failure.