TDD -- Spec-Driven Test-Driven Development

Spec-Driven TDD with a strict Red-Green-Refactor cycle using context-isolated subagents. Every feature starts with a structured spec; tests are generated from numbered acceptance criteria, with post-cycle three-dimension verification (Completeness + Traceability + Coherence), severity-tiered findings (CRITICAL/WARNING/SUGGESTION), and a spec-defect escape hatch that halts when the spec is internally contradictory or unimplementable instead of silently encoding it. Use when the user says "/tdd", "test first", "use tdd", "tdd approach", "write tests first", or when implementing new features/functionality. Trigger phrases: "implement", "add feature". Do NOT use for bug fixes…