Engine Interpreter Runtime: from SceneSpec to native lab
A validated specification should survive engine changes.
Principle
RealityKit is the first interpreter target, not the whole product boundary.
Pipeline
SceneSpec Validator -> RealityKit Interpreter -> Lab Workbench -> Telemetry, replay, goals.
Validation
The runtime consumes explicit objects and constraints, not prose.
Runtime
The interpreter layer leaves room for Unity, Unreal, or pixel streaming without rewriting the reasoning layer.