Support for Khronos Extensions

Is there a plan for including the Khronos Extensions schemas (e.g. KHR_materials_pbrSpecularGlossiness.schema.json) or should these be handled like custom extensions?

Start by reviewing the loader's existing extension-handling entry points and the Khronos schema example named in the issue, KHR_materials_pbrSpecularGlossiness.schema.json. Determine whether Khronos Extensions require dedicated support or can use the custom-extension path; done means the handling decision and its scope are clearly documented.

Written by the indexing model from the issue text.