CuTeDSL MLIR pipeline cannot lower any float→int op. All approaches fail: arith.fptosi, llvm.inline_asm, nvvm.inline_ptx, llvm.bitcast. Production path: dsv4/kernels/cuda/quantize_nvfp4.cu (raw CUDA, works). For NVFP4-1.1 fusion, use post-epilogue CUDA kernel approach. Removed dead test files (test_ptx_*, test_fp4_isolate*, test_minimal_cmp*, test_dtype_store, test_threshold_round).