- liveness: graph-routed tasks count as executing in getExecutingTaskIds/
isTaskActive and are skipped by recoverCompletedTask + the completed-task
resume fast-path — recovery can no longer drive a parallel lifecycle (P0)
- handleGraphFailure: sets status 'failed' (self-healing revival exemption,
prevents FN-5704-style re-run loop) and leaves paused tasks untouched
- execute seam distinguishes pause/abort from implementation failure
- merge seam: 30-minute timeout so a wedged queue cannot strand the run
- awaitAbortInFlightTaskWork: defensive interceptor/routing cleanup
- deleteWorkflowDefinition: cascades to selections, materialized steps,
affected tasks' enabledWorkflowSteps, and the project default
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