GrpImage/GrpSubImage verbatim; GrpImageTexture DDS path through CDXTCImage header + low-texture-memory mip bias, CreateDeviceObjects/CreateFromDiskFile verbatim; GrpTexture::SetTextureStage via STATEMANAGER. Port-map entries for GrpTexture/Image/SubImage/ImageTexture/IndexBuffer/VertexBuffer. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>