Drop the roughness (now consumed into _metallic_smoothness), ARM, and
height textures from the three existing brick material sets; no material
referenced them.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Three imported PBR texture sets with generated URP/Lit materials
(Brick 4, Brick Floor 002, Brick Wall 003), scene churn in Main and
The Room, ProBuilder palette/settings updates.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>