Scenario PATINA retexture

Overview

A mesh whose materials are flat colors or placeholders (an image-to-3D result, a whole diorama) becomes a PBR-shaded asset in three moves: group its materials into physical surface families, generate one seamless PATINA material per family on Scenario, and wire the five maps into Blender materials with vertices, faces, and transforms left unchanged. An optional film renders the original and the retextured scene along one camera path with the same lights, exposure, and cut, so the material response is the only thing that differs between the two panels. The film is rendered locally to present the 3D deliverable, never generated on Scenario, so the skill's output type stays 3D.