## 1. Contract

- [x] 1.1 Define the empty client-direction terminal receipt on `control.ack.v1`
- [x] 1.2 Run complete Protocol verification and deterministic generation checks

## 2. Immutable release

- [ ] 2.1 Publish one new never-reused immutable Protocol version after final contract verification
- [ ] 2.2 Resolve the version from separate empty consumer caches and record exact checksums