Add a Feature

When asked to add a new feature:

1. Read the existing codebase to understand current patterns, conventions, and architecture.
2. Identify the files that need to change and any new files required.
3. Write a failing test that describes the expected behavior.
4. Implement the feature using the smallest change that satisfies the test.
5. Run the full test suite to verify nothing is broken.
6. Review your own changes for consistency with existing code style.
7. If the feature has a UI component, start the dev server and verify it works visually.