Install the SBP compatibility dependency before Unity compiles scripts to prevent the VRChat SDK global ExtensionMethods collision.
- Add a pinned, embedded Scriptable Build Pipeline compatibility package, version 1.21.26, based on Unity 1.21.25.
- Preserve upstream source, GUIDs, and the Unity Companion License while disabling editor DLL auto-references.
- Keep the dependency in the project across Library regeneration. Unity Localization remains available.
- Update installation instructions and example scene assets.
Manual installation requires both the LCGUdonSharp ZIP and the SBP ZIP from SBP compatibility 1.21.26.
Validation: all eight release packaging tests passed, including dependency metadata and upstream source preservation.