3a906b881e
Evolve the existing readiness workflow into one persisted, user-controlled checklist rather than adding a second tracker. ApplicationChecklistItem records only completion state and user intent. Each default system item carries a stable SystemKey and an AutoSignal — the same signal /readiness already computed — and re-syncs on every read: a satisfied signal auto-completes the item, a reverted signal reopens it, and a manual tick always wins. Users can add, reorder, dismiss and delete. Readiness is refactored into a projection of the checklist (score = completion percentage, completed/missing = live items by status). Its DTO shape and the workflowSignal/reminders health view are unchanged, so no API contract breaks. The workspace's next recommended action now comes from the first pending checklist item in category priority order (preparation, submission, follow-up, interview, custom), replacing the parallel ruleset — so the overview can never recommend something already ticked off, and a user's own task can be next. The table follows the established MariaDB-safe path: the scaffolded migration is a no-op and the idempotent reconciler owns the DDL for both providers. Verified on MariaDB 11 — auto_increment PK, varchar/datetime(6)/tinyint(1) columns, both indexes inside the key limit, cascade delete, unique system key per application, and NULL system keys not colliding for custom items. 329 backend tests, 94 frontend tests, type check, production build and both Docker builds pass locally. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>