Keep course opt-outs auditable for operations staff

Operations coordinators miss unsubscribe state when 'Joined Free Group' tag applies. Create an unsubscribe-override record so ops prevent course messages after opt-out.

Overview

When unsubscribe state isn't recorded, students can keep getting course messages and operations lack an auditable trail. This workflow creates an override record at tag time, eliminating inconsistent opt-outs and giving ops a reliable audit trail so manual checks disappear.

Notable Features

Create auditable unsubscribe override records
Trigger on group tag changes
Prevent course messages after opt-out