Triage and the todo→in-progress scheduler already sorted by priority
(urgent→low, then createdAt ASC, then id ASC); the auto-merge queue
was strictly FIFO, so a backlogged low-priority task could merge
ahead of an urgent one. drainMergeQueue now picks the highest-
priority eligible task each iteration, and the four in-review sweeps
(startup, periodic, global unpause, engine unpause) sort by priority
before enqueueing so the single-item fast path also picks priority-
first. Picker is hardened against concurrent queue mutation by stop()
and pause-handler removal: it re-locates the chosen entry by id and
re-checks shuttingDown after awaiting getTask.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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