Generate UI and sample data from the spec, per operation

The spec is frozen as v1. How do we get something we can click without writing a front end by hand?

Generate the runnable artifacts from that version: a UI model, the process logic spec, Groovy controllers, and sample data, per operation. Play them in the operation player or from the app player. If the generation looks wrong, fix Draft and freeze the next version. Do not regenerate a moving draft and expect the same result twice.