[OMNIML-4889] cell_t1_d7

[ChenhanYu]

Draft PR opened by pensieve-intern for OMNIML-4889.

Stage cell_t1_d7 of Epic OMNIML-4885. The agent ran from the SPEC on the ticket description; review every change before marking ready.

Always-draft is enforced — the bot never auto-merges.

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Agent's self-narration (stripped from PR diff; surfaced here for context):

VERIFICATION_COMMENT.txt:

OMNIML-4889 (Cell t1_d7) already has the expected cell YAML and runtime_params present in this repo:
- tools/launcher/examples/Qwen/Qwen3.5-4B/specdec_bench_mtp_vllm_t1_d7.yaml
- tools/launcher/common/specdec_bench/_cells/qwen35_4b_mtp_vllm_t1_d7.yaml

The working tree is on branch pensieve-intern/OMNIML-4885/cell-t1-d7 with those files staged. Base model Qwen/Qwen3.5-4B exists on HF Hub.

Per the run instructions in this session, I did not commit, push, open a PR, or submit slurm jobs. Please run the PR/slurm steps in the runner that handles publishing, or switch to the correct branch for OMNIML-4889 if needed.

Pollution-strip removed VERIFICATION_COMMENT.txt from this commit (sidecar narration and/or incidental lockfile regeneration are never part of the agent's intended deliverable).

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