An engine restart that kills an in-flight pre-merge step session (FN-8492's
Code Review) left its pending workflowStepResult behind with no live session.
The merge gate read it as incomplete pre-merge steps, surfaced an identical
stall every 30 minutes, and the deadlock disposer parked the task failed two
hours later. resolveOrphanedPendingStepResults existed for exactly this but
shipped with no caller (same U9 gap as the adoption table).
Wire it: a startup sweep right after legacy adoption clears pending results
whose task has no live session (activeSessionRegistry / executingTaskLock /
isTaskActive), emitting task:reconcile-orphaned-pending-step-results with
ids/counts-only metadata. User pauses and live resumed sessions are never
disturbed.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
4413699de0