BD TRELLIS.2 Retexture

Retexture an existing TRELLIS.2 shape with a new reference image. Convenience node that combines conditioning + texture generation in one step. Takes an existing shape_result and applies new PBR texture from a different image. Use cases: - Generate shape from one image, apply texture from another - Iterate on textures without regenerating shape (faster iteration) - Apply different art styles/colors to the same 3D shape - Test multiple texture seeds on the same geometry Equivalent to: Get Conditioning (new image) → Shape to Textured Mesh (texture_conditioning) but simpler to wire up.