updateLocalEntry's UpdateEntry was the last filer call on the sync path
without a deadline. A filer that never answers the stamp keeps the job and
its path in the conflict index the same way an unanswered lookup did. The
stamp carries IF_ENTRY_EQUAL, so a retried event after a timeout either
stamps again or skips a stamp that already landed.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>