[OMNIML-4927] specdec_bench cell t0_d3 — Qwen/Qwen3.5-4B / MTP / vllm

[ChenhanYu]

Summary\n- Add specdec_bench MTP vllm cell t0_d3 for Qwen/Qwen3.5-4B\n\n## Testing\n- Not run (cell YAML only)

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.70%. Comparing base (5eba879) to head (32bc942).
⚠️ Report is 22 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1614      +/-   ##
==========================================
- Coverage   76.88%   75.70%   -1.18%     
==========================================
  Files         478      481       +3     
  Lines       52209    55406    +3197     
==========================================
+ Hits        40140    41945    +1805     
- Misses      12069    13461    +1392     

Flag	Coverage Δ
unit	53.95% <ø> (+0.43%)	⬆️

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