Orch Pipeline is a shared orchestration engine for the orch-* skill family that defines the gated Research-Plan-TDD-Review-Commit pipeline, size classifier, agent map, and human gates. It is applied when an operation skill delegates its gated development workflow rather than being invoked directly. Reach for it when you need a standardized, multi-phase pipeline that sizes complexity, enforces test-driven development, and pauses for human approval at key planning and commit checkpoints.