Add claude configuration about tests

.claude/memory/feedback_tests.md

@@ -0,0 +1,14 @@
+---
+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