Reaper now runs at the top of every dispatcher tick regardless of per-board connect() failures. Previously the reaper sat inside dispatch_once after the kanban_db.connect() call — any EIO during connect would skip reaping for that tick, accumulating zombie workers and stale claim_lock rows.
Also: reap_worker_zombies now returns the list of reaped pids (the dispatcher logs them) and a test indentation fix.
Squashes three sibling commits from PR #32301 into one logical change for batch review.
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