Function upload_spatial_tensor_attribute_chunks 

pub fn upload_spatial_tensor_attribute_chunks(
    runtime: &WgpuRuntime,
    tensor: &SpatialTensor<'_>,
    layout: AoSoAAttributeLayout,
) -> SpatialResult<Vec<GpuAoSoAttributeChunk>>

Packs and uploads every tensor chunk with an explicit attribute layout.