Human/AI system builder

The agent MUST build a project-contract before implementation. Start from references/project-contract.md and assets/project-contract.template.yaml.

The agent MUST make every decision below explicit:

• Actors.
• Canonical store.
• Human surface.
• AI surface.
• Sync direction and trigger.
• Conflict detection and resolution.
• Validation timing and location.
• Generated artifacts.
• Human startup flow.