The script API is documented by reading it back from a running engine, not by parsing source. CI fails on drift.

Rune scripts. Every subsystem declares its bindings once, against a seam with no language in it, so a second language cost the engine nothing.

A second physics world on rapier2d, 2D drawing in z order, a 2D gizmo in the editor, and a slingshot game to prove it.

The first commit: eight crates, one example, and the two things the engine is built around — hot reload that keeps state, and determinism.