spike(QUANT-CT-MXFP4): native MXFP4 keep-quant + Qwen e2e — W0 vehicle + W1 target pinned

.agents/quantization-matrix.md

@@ -127,7 +127,7 @@ Registry source:
 | `QUANT-FP8-PCPT` | ModelOpt FP8 per-channel/per-token | W8/A8 | capability selected | - | - | - | - | - | `INVENTORIED` | - | leaf spec open | - |
 | `QUANT-MXFP8-MODELOPT` | ModelOpt MXFP8 | W8/A8 | CUDA/ROCm/XPU dispatch | - | - | - | - | - | `INVENTORIED` | - | leaf spec open | - |
 | `QUANT-MIXED-MODELOPT` | ModelOpt mixed precision | FP8/NVFP4/MXFP8 groups | per-layer | part | part | part | Y | Y | `PARTIAL` | 35B FP8+NVFP4 slice: [loader](../src/vllm/model_executor/models/qwen3_5_weights.cpp#L118), [FP8 tests](../tests/vt/test_ops_fp8_cutlass.cpp#L188), [NVFP4 tests](../tests/vt/test_ops_moe_grouped.cpp#L453), [gate](../tests/parity/test_qwen36_paged_engine.cpp#L78) | leaf spec open | - |
-| `QUANT-CT-MXFP4` | compressed-tensors MXFP4 `mxfp4-pack-quantized` (group 32, E8M0 block scales, NO global) | W4/A4 (W4A16 dequant landed; W4A4 GEMM later) | CUDA GB10 (FlashInfer W4A4 else Marlin W4A16); CPU dequant | Y | Y | - | - | - | `ANCHOR-BACKFILL` | CPU weight unpack + E8M0 dequant: NEW [mxfp4_dequant.h](../include/vllm/model_executor/model_loader/mxfp4_dequant.h) + [.cpp](../src/vllm/model_executor/model_loader/mxfp4_dequant.cpp#L14) (`E8M0ToF32` = `2^(byte-127)`, `DequantMxfp4ToBf16`/`ToF32`, group 32, no global; reuses `kE2M1Lut`). Unit gate [test_mxfp4_dequant.cpp](../tests/vllm/test_mxfp4_dequant.cpp#L34) — E8M0 known-byte decode, hand-computed 32-group dequant (bf16+f32), the E8M0-vs-fp8 + group-32-vs-16 RED traps, multi-row/group offsets, randomized rel-error vs a double-precision port of `dq_mxfp4_torch` with bf16==f32 exactness. CPU `-Werror` 0-warn. Ports FROM `compressed_tensors_w4a4_mxfp4.py:20-97` + `mxfp8_utils.py:61-65,222` + golden `tests/quantization/reference_mxfp4.py:28-117`. C/E/P PENDING: GPU W4A4 fp4 GEMM + Marlin W4A16 fallback + MoE expert path + e2e are NAMED later bricks; DeepSeek-V4 + Kimi-K3 loaders consume this once wired | [MXFP4 spike](specs/mxfp4-compressed-tensors.md) | `CLAIM-QUANT-MXFP4` |
+| `QUANT-CT-MXFP4` | compressed-tensors MXFP4 `mxfp4-pack-quantized` (group 32, E8M0 block scales, NO global) | W4/A16 native **Marlin mxf4 keep-quant** landed (GB10 target; W4A4 cute-dsl crashes sm_121) | CUDA GB10 Marlin W4A16 (E8M0, group_blocks=2); CPU dequant fallback | Y | Y | Y | Y | - | `ANCHOR-BACKFILL` | **W2 native compute + W3 gates + e2e (row/QUANT-CT-MXFP4, `1c5ee09e`):** W0 vehicle `Yi30/Qwen3-8B-MXFP4` runs on the 0.25.0 oracle; W1 traced FlashInfer-W4A4-selected-but-crashes-on-sm_121 -> **Marlin W4A16 is the GB10 target**. Native path: `generate_kernels.py` MXFP4 config (`kFE8M0fnu`, group_blocks 2) + regenerated instances; [`MarlinProcessExpertScalesMxfp4`](../src/vt/cuda/cuda_marlin_repack.cu) (byte-exact vs vLLM at all shapes); `MoeMarlinArgs.{group_size,mxfp4}` launcher branch; `Nvfp4Weight.{group_size,is_mxfp4}` + [`dense_nvfp4_gemm.h`](../include/vllm/model_executor/models/dense_nvfp4_gemm.h) branch + `MatmulMxfp4W4A16D`; [`dense_weight_loaders.h`](../include/vllm/model_executor/models/dense_weight_loaders.h) MXFP4 loaders; `qwen3_weights.cpp` detect+load. **Gates GREEN:** op-level GEMM vs independent CPU dequant 0.36% M=1/M=8 all real shapes ([`test_ops_moe_grouped.cpp`](../tests/vt/test_ops_moe_grouped.cpp)); model-facing `MakeLinearMethod->Apply->BuildMarlinDenseResident` bad=0 K=4096+12288 ([`test_linear_method.cpp`](../tests/vllm/model_executor/layers/test_linear_method.cpp)); **e2e 3/4 token-exact vs oracle golden (async-off)** ([evidence](../docs/bench-evidence/mxfp4-qwen/W3-e2e-result.md)). RESIDUAL: default-async degeneration is a PRE-EXISTING classic-dense-Qwen3 async bug (device-mirror not wired for `qwen3.cpp`, quant-independent, SEPARATE row); W4 bench owed; p3 formal distributional gate owed. Earlier CPU weight unpack + E8M0 dequant: NEW [mxfp4_dequant.h](../include/vllm/model_executor/model_loader/mxfp4_dequant.h) + [.cpp](../src/vllm/model_executor/model_loader/mxfp4_dequant.cpp#L14) (`E8M0ToF32` = `2^(byte-127)`, `DequantMxfp4ToBf16`/`ToF32`, group 32, no global; reuses `kE2M1Lut`). Unit gate [test_mxfp4_dequant.cpp](../tests/vllm/test_mxfp4_dequant.cpp#L34) — E8M0 known-byte decode, hand-computed 32-group dequant (bf16+f32), the E8M0-vs-fp8 + group-32-vs-16 RED traps, multi-row/group offsets, randomized rel-error vs a double-precision port of `dq_mxfp4_torch` with bf16==f32 exactness. CPU `-Werror` 0-warn. Ports FROM `compressed_tensors_w4a4_mxfp4.py:20-97` + `mxfp8_utils.py:61-65,222` + golden `tests/quantization/reference_mxfp4.py:28-117`. C/E/P PENDING: GPU W4A4 fp4 GEMM + Marlin W4A16 fallback + MoE expert path + e2e are NAMED later bricks; DeepSeek-V4 + Kimi-K3 loaders consume this once wired | [MXFP4 spike](specs/mxfp4-compressed-tensors.md) | `CLAIM-QUANT-MXFP4` |
 | `QUANT-CT-W4A8-FP8` | compressed-tensors W4A8 FP8 | W4/A8 | CUTLASS | - | - | - | - | - | `INVENTORIED` | - | leaf spec open | - |
 | `QUANT-CT-W4A8-INT8` | compressed-tensors W4A8 INT8 | W4/A8 | platform selected | - | - | - | - | - | `INVENTORIED` | - | leaf spec open | - |
 | `QUANT-CT-W8A8-FP8` | compressed-tensors W8A8 FP8 | W8/A8 | platform selected | - | - | - | - | - | `INVENTORIED` | - | leaf spec open | - |