Add notification digests with ON CONFLICT DO UPDATE, migrations 00068-00070, supplementimpact module (analyze → confirm → claim-aware split), and wire coordinator/mutate hooks plus proposal_required digests.
Poll pending requests every 15 minutes, emit deduplicated escalation notifications, and close requests when creator confirms stage advance. Co-authored-by: Cursor <cursoragent@cursor.com>
Write outbox row and creator notification when a stage first becomes advance-ready. Co-authored-by: Cursor <cursoragent@cursor.com>