Deletes Assets/Materials/Substance (41 .sbsar + metas, folder metas), the LFS rule for
*.sbsar, SUBSTANCE_PLUGIN_ENABLED from the Standalone scripting defines, and five
materials with zero GUID referrers (Assets/Steel, Steel brushed, Radiators 1,
Thrusters, Discobolus Bronze). Surviving materials and prefabs still name the removed
guids until the next commit repoints them.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
6222b5c711
