Release v7.99.0

Added

• A fast path in the Screenplay toolchain skill that takes an agent from requirements to a running Cratis application: model, validate --executable, render --check, render, build, run Chronicle, backend and frontend (#849)
• Screenplay skills now state the traps a modeling agent hits before its first render: lowercase enum members, specifications that state every property, one keyed query for read models with two *Id properties, observable lists for live screens, no optional event properties for the Cratis target, and the default application shell from Stage 4.189.3
• An executable existence guard example (protected read) so commands against an unknown id are refused