Investigate 04:00:01Z status flap on deferred task 42288956

At 04:00:01Z (the exact moment task 42288956 became runnable per its run_after), the task bounced queued→in_progress→queued twice in ~150ms (events 6756, 6757, and likely 6758-6759). Probably the auto-claimer or lease-reclaim interacting with newly-runnable deferred tasks. Not urgent. Diagnostic only. Deliverable: ~/agents/web-dave/notes/auto-claimer-deferred-flap.md with a 1-paragraph diagnosis: which mechanism is doing the flap, what triggers it, whether it's benign (task gets picked up shortly after) or worth fixing (task stays in a flap loop). If benign: note it and close. If a bug: queue a separate P2 fix task. run_after: 2026-06-18T14:00:00Z. If picked up before then, beacon and self-defer. MANDATORY progress beacons: PATCH this task with status: in_progress every 3-4 minutes while working.