- preserved the playable Unity/C# racing systems prototype;
- replaced the machine-specific glTFast package reference with a reproducible versioned package source;
- added exact Unity-editor reproduction and validation instructions;
- added repository, evidence, package, privacy, and path validation;
- added GitHub Actions validation without requiring a Unity licence in CI;
- formalised the existing eleven-image screenshot set as Screenshot Group 01;
- documented maintenance-only status and future toolkit separation;
- added security, release, and GitHub metadata documentation.