Tdd

Implement the following feature using strict TDD: $ARGUMENTS

Think about how to break down the feature into small, testable units (if applicable). Then, for each unit, follow the strict TDD workflow below:

1. Write behavior-oriented tests based on expected input/output pairs - test WHAT the code does, not HOW it does it
2. Do NOT create mock implementations, unless strictly necessary - write real tests that will fail
3. Run uv run pytest -v only on the new tests to confirm they fail
4. Write code that passes the tests
5. Do NOT modify the tests during implementation, unless strictly necessary - tests should verify behavior, not implementation details
6. Run uv run pytest -q --tb=short to verify tests pass (quiet mode, concise failures). If many tests fail, use -x to stop on first failure and fix incrementally
7. Commit the implementation

Once all units are complete and passing, use gh pr create to open a PR with test and implementation commits.

IMPORTANT: Tests first, implementation second. Never modify tests during step 6. Tests should verify behavior (inputs/outputs), not implementation details.

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