[OMNIML-4886] specdec_bench cell t0_d3 — Qwen/Qwen3.5-4B / MTP / vllm

[ChenhanYu]

Summary

• add SPEED-bench cell t0_d3 for Qwen/Qwen3.5-4B MTP vLLM

Testing

• not run (cluster execution only)

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.85%. Comparing base (5eba879) to head (e0cdb1e).
⚠️ Report is 22 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1608      +/-   ##
==========================================
- Coverage   76.88%   75.85%   -1.03%     
==========================================
  Files         478      481       +3     
  Lines       52209    55107    +2898     
==========================================
+ Hits        40140    41802    +1662     
- Misses      12069    13305    +1236     

Flag	Coverage Δ
unit	53.90% <ø> (+0.38%)	⬆️

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