Runtime
How a scene script becomes a timeline, how frames resolve from it, and how actors host one another.
A scene script runs once and records a timeline. A host then asks the compiled scene for frames, in any order, and each answer depends on the frame alone.
Scenes
Scene orchestration
The cursor, the timing verbs, spawning, inputs and compositions.
Compiled scenes
Frame state, lookups, caching and reflection.
Determinism
What a frame may depend on.