Optional outbound channel for admin-facing events: new high-priority feedback, escalation thresholds (post reaches N votes), changelog published (notify SMS subscribers who opted in), support ticket assigned, integration error alerts. Per-admin notification preferences (which event types, which channel).

Implementation: new notification_channels table (org_id, channel enum sms|whatsapp|voice, twilio_sid, from_number, status), per-user notification_subscriptions (user_id, event_type, channel). Sends via Programmable Messaging (use the twilio-send-message skill); voice optional in v1. Twilio creds stored at org level encrypted; webhook for delivery status updates feeds an outbound_log table. Out of scope: end-user marketing SMS, two-way SMS conversations, inbound voice (use the customer-support-architect for that scope).