test-first

Use when implementing any feature, bugfix, or refactor that has a testable outcome. Activate for keywords like "TDD", "test-first", "red-green", "write the test first", "implement <feature>", "fix <bug>". Enforces the red-green-refactor discipline - — write a failing test, make it pass with the smallest change, refactor with tests as a safety net. Always paste the red and green test runner output - — never claim…