misskey4ririca

Use whenever editing or adding code under `packages/backend/` — including REST API endpoints, NestJS services/modules, TypeORM entities, migrations, and backend tests. Covers NestJS DI patterns, TypeORM entity conventions, endpoint-list registration, meta/paramDef/res, misskey-js regeneration, migration up/down rules, and the `.config/test.yml` prerequisite. Must be consulted before any backend change to avoid CI failures and production incidents. This is NOT waived by having already invoked brainstorming, writing-plans, or any other upstream skill — invoke this at implementation time regardless of what preceded it.