The save state listens to the queue before the session does, so when the
ack takes the delete out of the queue, the save state's change can run
the deleted-page check before the session's queue listener records the
page as deleted here. With the live read ahead of the ack and an earlier
edit paused, the teammate notice still showed. The check now records
the accepted deletes in the queue it reads.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>