Function emit_spatial_gemm_test_with 

pub fn emit_spatial_gemm_test_with(
    m: usize,
    n: usize,
    k: usize,
    ts: usize,
    its: usize,
    ip: usize,
    u: GemmUnroll,
    class_name: &str,
) -> Result<String, String>

The same emission with the loop widths given explicitly — the form the parity corpus uses to reproduce a Spatial variant’s exact configuration.