workflow-build-feature — End-to-End Feature Build

Degree of freedom: MIXED. How to implement Phase 2 [HIGH freedom]; phase order and "no implementation before RED" [LOW freedom — run exactly].

One command that runs the full feature loop. Don't skip phases — each gate catches a class of defects the next phase can't.

How to reason

1. Contract — what observable behavior is in / out of scope?
2. Sequence — which phase is next, and what would skipping it hide?
3. Prove — RED was real; GREEN and smoke cover the contract
4. Handoff — PR evidence is complete; no silent "looks done"

Worked example