- Add write endpoint tests: POST /create, PATCH /:uid/edit, DELETE /:uid - Add GET /sync-status tests (D-09 outbox polling) - Add GET /writable-calendars tests (D-03 writable set, access control) - Wire db.insert and db.transaction into the vi.mock for db/client.js - Mock devAuthBypass to inject dev user in write-endpoint tests - All 9 new tests are RED (routes not yet registered)