Workplan for delegating maintenance automation from the state hub to
activity-core via NATS JetStream. Covers NATS publisher wiring, subject
schema, lifecycle event emission, cron migration stubs, and delegation
protocol docs.
Hub workstream: d8ac100b-a844-46a5-9684-415df0d32539
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
