Updates .json and .skel files to current binary format. Adds [runtimes] prefix to AGENTS.md for repo-wide changes. Adds diff.ts pi extension.
* Add a new example level '10-physics' and assets of celestial-circus * Fixed typos and grammatical errors in comments * Add a new example scene to example-v4 * Add a new example scene to example-v4-charp * Add a new example scene to example
