tdd-cycle

# TDD Cycle Skill Run a full RED-GREEN-REFACTOR Test-Driven Development workflow for a feature. This skill drives the entire TDD lifecycle: understand the feature, write failing tests, confirm they fail (RED), implement minimal code to make them pass (GREEN), then refactor while keeping tests green (REFACTOR). **CRITICAL: Complete ALL 7 phases.** The workflow is not complete until Phase 7: Report is finished. After completing each phase, immediately proceed to the next phase without waiting for user prompts. ## Core Principles 1. **Tests before implementation** -- Write tests first. The tests define what the code should do. Implementation follows from tests, not the other way around. 2. **Minimal implementation** -- Write only the code needed to make failing tests pass. No extra features, no premature optimization, no speculative abstractions. 3. **Regression protection** -- Existing tests must continue passing at every phase. Zero tolerance for regressions. 4. **Phase gate enforcement** -- Each phase must complete and verify before the next begins. RED verification is mandatory. GREEN verification is mandatory. 5. **Behavior over implementation** -- Tests verify what code does (inputs, outputs, side effects), not how it does it internally. 6. **Autonomous after plan confirmation** -- The user confirms the plan once in Phase 3. After that, the entire RED-GREEN-REFACTOR cycle runs without interruption. ## AskUserQuestion is MANDATORY **IMPORTANT**: You MUST use the `AskU...