[OMNIML-5024] specdec_bench cell t0_d3 — google/gemma-4-E4B-it / MTP / vllm

[ChenhanYu]

Adds the SPEED-bench MTP/vLLM parent YAML for google/gemma-4-E4B-it and the t0_d3 runtime_params cell.\n\nSweep: gemma-4-E4B-it_mtp_vllm_t0_d3

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 56.59%. Comparing base (111b7eb) to head (6fc56ed).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1663      +/-   ##
==========================================
+ Coverage   56.58%   56.59%   +0.01%     
==========================================
  Files         507      507              
  Lines       55794    55794              
==========================================
+ Hits        31573    31579       +6     
+ Misses      24221    24215       -6     

Flag	Coverage Δ
unit	54.41% <ø> (+0.01%)	⬆️

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