Expand writing_tests.md with:
- Quick reference table and decision tree for test type selection
- Workflow framework tests section
- API test patterns: populators, decorators, fixtures, user switching
- Integration test patterns: config options, mixins, app access
- Selenium test patterns: smart components, accessibility, shared state
- When to use UI vs API methods in browser tests
Add client/README.md testing section:
- Test file structure and standard imports
- LocalVue setup and test data factories
- MSW/OpenAPI-MSW for type-safe API mocking
- Vue component testing patterns