[OMNIML-4930] specdec_bench cell t1_d7 — Qwen/Qwen3.5-4B / MTP / vllm

[ChenhanYu]

Summary\n- add SPEED specdec_bench cell t1_d7 for Qwen3.5-4B MTP vLLM\n- add per-cell runtime params for t=1 d=7\n\n## Testing\n- not run (yaml-only change)

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.44%. Comparing base (5eba879) to head (415f780).
⚠️ Report is 24 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1619      +/-   ##
==========================================
- Coverage   76.88%   75.44%   -1.44%     
==========================================
  Files         478      482       +4     
  Lines       52209    55600    +3391     
==========================================
+ Hits        40140    41949    +1809     
- Misses      12069    13651    +1582     

Flag	Coverage Δ
unit	53.93% <ø> (+0.41%)	⬆️

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