--- name: Always include tests with changes description: All code changes must include appropriate tests; never ship untested code type: feedback --- All changes (new features, bug fixes, refactors) must include tests as part of the same implementation. Do not ship code without accompanying tests. **Why:** User explicitly called out that tests were missing from Issue #1 implementation and expects tests to always accompany changes going forward. **How to apply:** - Go backend: add `_test.go` files alongside changed packages, using `httptest` for handler tests and a real (or in-memory) DB for store tests - Frontend: add `.test.tsx` files alongside new/changed pages and components using React Testing Library - Tests go in the same PR/commit as the code they cover — never as a follow-up