Third review follow-ups:
- A sender that found nothing waiting checks again after letting go of the
send lock, so a change saved in that moment is sent, not left for a retrier.
- A report is compared with a removal using its full-precision start time, so
a report sent after the address was removed is logged as sent.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>