build-tdd

Enforces the red → green → refactor TDD cycle for every new behavior or bug fix — no shortcuts. Cycle: 1. Red — write a failing test that expresses the desired contract 2. Green — write the minimum code to make it pass 3. Refactor — clean up duplication and naming without breaking the test Every failure must be for the right reason (not a setup error). Every implementation must be minimal — no over-engineering to anticipate future needs.