Instancer: Treating Babylon Lite Instances Like Real Application Objects

[labris]

Done.

Babylon Lite Explorer

0.7.0 - 2026-10-15 Changed Raised the Babylon Lite peer and development baseline to 1.34.0 and the optional Instancer baseline to 0.7.0. Migrated the VAT example from the removed mat4Compose() export to composeMat4(). Removed the environment Y rotation control: SceneContext.envRotationY is no longer public, and setEnvironmentRotation() has no public readback API. Updated integration guides and added 1.34.0 migration notes. Added regression coverage using current Lite light and material factorie…