mirrorMessagingOutbound always stamped messagingMirroredAt even when
mirrorRun returned early, so the job reconciler never retried completed
messaging runs whose channel or DM mirror was skipped or not yet durable.
Gate the recovery marker on mirror disposition (complete vs retry), only
set it for completed messaging runs, and leave it null when mirrorable
bot text still exists but was not written to the outbox.
Co-authored-by: cynarAI <cynarAI@users.noreply.github.com>
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