Stop Letting AI Write Untestable Code. Add Determinism Back with TWD

TWD (Test While Developing) is a methodology and tooling setup that enforces deterministic, testable code when using AI code generation. It auto-detects project settings (framework, build tool, state management, CSS libraries) from config files, then generates a .claude/twd-patterns.md configuration to guide AI toward writing testable code with proper mocking, state reset, and test coverage.