GPU renderer

The stack is TypeGPU on WebGPU: typed schemas, bind group layouts and pipelines, with WGSL where it's clearer. Don't add a second rendering library.

For 3D models and textures, use Blender if it's available. Prefer a Blender MCP server when one is installed; otherwise run headless (blender -b --python script.py). Keep the scripts in the repo, so every asset is reproducible from code rather than hand-edited.

Architecture