[CT] Support Humming for WNA16 MoE

[yiliu30]

Summary

Enable Humming for compressed-tensors WNA16 MoE checkpoints.

This change:

• extends the WNA16 MoE Humming bridge to accept compressed-tensors QuantizationArgs
• allows the Humming path to initialize for sub-byte WNA16 checkpoints instead of hard-failing in the Marlin-only path
• uses the checkpoint layout Humming expects for MoE weights
• adds regression coverage for the W2A16 Humming route
• adds a small helper script for the local offline inference repro command

Why This Is Not Duplicating An Existing PR

I checked for open PRs in the same area and did not find an existing one covering this fix.

Model Evaluation Results

vllm ({'pretrained': 'INC4AI/Qwen3-30B-A3B-Instruct-2507-Attn4bits-Mlp2bits-AutoRound-200iters-TestOnly', 'tensor_parallel_size': 1, 'max_model_len': 8192, 'max_num_batched_tokens': 32768, 'max_num_seqs': 128, 'add_bos_token': True, 'gpu_memory_utilization': 0.4, 'dtype': 'bfloat16', 'max_gen_toks': 2048, 'enable_prefix_caching': False}), gen_kwargs: ({}), limit: 1000.0, num_fewshot: None, batch_size: 128
|Tasks|Version|     Filter     |n-shot|  Metric   |   |Value|   |Stderr|
|-----|------:|----------------|-----:|-----------|---|----:|---|-----:|
|gsm8k|      3|flexible-extract|     5|exact_match|↑  |0.909|±  |0.0091|
|     |       |strict-match    |     5|exact_match|↑  |0.909|±  |0.0091|

AI Assistance

This PR was created with AI assistance. The submitting human is responsible for reviewing every changed line and validating the change end-to-end.

cc @mgoin @bradhilton @hshen14 @thuang6

[claude]

Claude Code Review

This pull request is from a fork — automated review is disabled. A repository maintainer can comment @claude review to run a one-time review.

[mergify]

Documentation preview: https://vllm--48918.org.readthedocs.build/en/48918/

[mergify]

This pull request has merge conflicts that must be resolved before it can be
merged. Please rebase the PR, @yiliu30.

https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/working-with-forks/syncing-a-fork

[mergify]

Hi @yiliu30, the pre-commit checks have failed. Please run:

uv pip install pre-commit>=4.5.1
pre-commit install
pre-commit run --all-files

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[mergify]

Hi @yiliu30, the pre-commit checks have failed. Please run:

uv pip install pre-commit>=4.5.1
pre-commit install
pre-commit run --all-files

Then, commit the changes and push to your branch.

For future commits, pre-commit will run automatically on changed files before each commit.

[yiliu30]

/ci run

[github-actions]

✅ Triggered Buildkite CI #84356 for commit 0377ea651d8f.

[mergify]

Hi @yiliu30, the pre-commit checks have failed. Please run:

uv pip install pre-commit>=4.5.1
pre-commit install
pre-commit run --all-files

Then, commit the changes and push to your branch.

For future commits, pre-commit will run automatically on changed files before each commit.

[mergify]

Hi @yiliu30, the pre-commit checks have failed. Please run:

uv pip install pre-commit>=4.5.1
pre-commit install
pre-commit run --all-files

Then, commit the changes and push to your branch.

For future commits, pre-commit will run automatically on changed files before each commit.

[mergify]

Hi @yiliu30, the pre-commit checks have failed. Please run:

uv pip install pre-commit>=4.5.1
pre-commit install
pre-commit run --all-files

Then, commit the changes and push to your branch.

For future commits, pre-commit will run automatically on changed files before each commit.

[mgoin]

/ci run

[github-actions]

✅ Triggered Buildkite CI #84461 for commit b55b88dc4cb9.

[yiliu30]

/ci run

[github-actions]

✅ Triggered Buildkite CI #84511 for commit e9f894ecc274.