1. Added phase to SubscriptionDataMigration that removes unpaid
   subscriptions for dependents who are archived or no longer active
   (e.g., temporary members who became inactive, frozen children).

2. Fixed WaiverProcessor referencing non-existent 'reason' column in
   fines table — correct column is 'notes'.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>