Function build_warp_pipeline_from_wgsl 

fn build_warp_pipeline_from_wgsl(
    device: &Device,
    pipeline_layout: &PipelineLayout,
    target_format: TextureFormat,
    source: &str,
) -> Result<RenderPipeline>

Build the wgpu render pipeline. Vertex layout matches WarpVertex (pos_clip at @location(0), uv_warp at @location(1)); fragment targets target_format with BlendState::REPLACE (the warp pass owns the entire render target).