Classifies the 16 production-pending migrations added since the 10-14 list (A 1, B 3, C 7, D 5) with what production users see and what the rehearsal should check. The one user-visible rewrite is the first-question-free backfill: accounts that already completed a real question count as used, confirmed by the product owner on 2026-11-01. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01DbBXoyeZrYn6ryNcSe5Y2Y