Closes the crash-safety gap: a run left in running/pending by a crash had
nothing to resume it (the scheduler only wakes 'waiting'). Adds a heartbeat
(workflow_runs.updated_at, stamped on every node advance + start/resume) and a
recoverStaleRuns() sweep that re-enters runs whose heartbeat has gone stale
(>10 min) from their persisted node. Runs on the scheduler tick AND the boot
tick, so a restart catches anything stranded during downtime.
Re-entry is at-least-once (the current node may re-execute) — loop counters +
the late-fee math are idempotent, so the only residual risk is a duplicate
reminder email. An attempts counter (migration 145, cap 5) marks a run failed
instead of recovering a node that reliably crashes the process (crash-loop
backstop). Flag-gated. Tests: orphan-resume + crash-loop cap.
Luca
192d2cbc06