Applies disciplined test-driven development using Red-Green-Refactor cycles with modern TypeScript/Bun and Rust tooling. Use when implementing features with TDD, writing tests first, refactoring with test coverage, bug fixes requiring test reproduction, or when TDD, test-first, red-green-refactor, testing methodology, or --tdd flag are mentioned. Covers test quality, mutation testing, and both TypeScript and Rust workflows.
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examples/bug-fix.mdexamples/feature-implementation.mdreferences/quality-metrics.mdreferences/test-patterns.md