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Recovers tasks abandoned mid-flight (status in queued/planning_brd_prd_sdd/ coding/validating with no recent execution_event) by re-driving them through task_execution.run_or_resume_task_lifecycle on a background poll, guarded by an in-process in-flight lock to avoid double dispatch. Responds to a real 2026-08-06 incident where a task sat stuck in 'validating' for 15+ hours with nothing polling it. Scoped to FR-2 only from docs/todo/scheduler-production-polling-loop- requirements.md; FR-1 (new-goal auto-dispatch) stays out per that doc's own non-goals -- it's a separate, larger autonomy-boundary decision. Design recorded in docs/todo/scheduler-production-polling-loop-design.md. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
