Full UI redesign plan covering 9 phases: app shell, project/customer context,
templates view with readiness badges, migration workflow, issues view,
verification (with new verify API), history/audit, settings, and smoke test
checklist. Only backend additions are Phase 16 (blockers/warnings in status
endpoint) and Phase 19 (verify router). All other phases are frontend-only.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>