Terminate suppressed legacy reminder series at ownership transfer

When a newer automation takes exclusive ownership of a workflow episode, suppressing only the next legacy reminder is insufficient. Terminalize the legacy task, or make every later occurrence revalidate episode ownership immediately before provider submission. Treating a policy skip as a successful recurring occurrence and advancing its run counter can bypass first-run-only guards and leak a stale message from the old scheduler. This applies only when ownership is exclusive and attributable to the same active episode; intentionally shared or independently scoped reminders may continue.

Applies when: Two reminder schedulers overlap during a workflow ownership transition. Keywords: reminder scheduler legacy ownership skip recurrence cancellation provider