1. Click a face on the truck body. Flood-fill picks the flat patch it belongs to.
2. Adjust Face threshold (top bar) to grow / shrink the patch.
3. Press Queue delete to enqueue those centroids to truck_delete_queue.json.
4. Tell Claude "apply the queue" — Blender MCP cuts the faces and re-exports the GLB.
5. Press Reload GLB to see the result.