Add an optional lane filter to the monitor task lease so callers can pull
a specific lane (e.g. high) and scope authorization-failure cancellation
to the failing task's business date, so a challenge on one day no longer
cancels queued tasks for another day. Monitor authorization-failure
cancellation now requires a business date and no-ops without one. Also
stop writing the nonexistent desktop_tasks.completed_at column when
canceling queued tasks for an authorization failure.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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