The PR-gate turn cut (#295) already auto-submitted assembled tasks, but
its refusals fell back to a PM spawn silently -- in production the PM
turns the cut was meant to remove kept happening with no visible cause
(live case: an AC-coverage refusal). The flag is gone (the fallback is
the safety net), the umbrella/branchless exclusion uses the canonical
batch predicates, and every refusal reason now rides into the spawned
PM's prompt so the fallback starts informed.