[OMNIML-4881] cell_t0_d7

[ChenhanYu]

Draft PR opened by pensieve-intern for OMNIML-4881.

Stage cell_t0_d7 of Epic OMNIML-4879. 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:

Spec partial execution for OMNIML-4881 (cell t0_d7).

Completed:
- Verified HF Hub model availability with huggingface_hub (Qwen/Qwen3.5-4B).
- Authored cell YAML: tools/launcher/examples/Qwen/Qwen3.5-4B/specdec_bench_mtp_vllm_t0_d7.yaml.
- Authored runtime params: tools/launcher/common/specdec_bench/_cells/qwen35_4b_mtp_vllm_t0_d7.yaml.

Blocked by runner instruction:
- This run explicitly forbids commit/PR creation and slurm submission. Spec steps 3–6 (commit/PR, slurm submit, wait, JIRA stamp) were not executed.

Next actions (for follow-up run with PR/submit enabled):
- Commit the two files on branch pensieve-intern/OMNIML/cell-t0-d7.
- Open PR titled "[OMNIML-4881] specdec_bench cell t0_d7 — Qwen/Qwen3.5-4B / MTP / vllm".
- Submit slurm.py from nmm-sandbox workspace and capture experiment_id.
- Wait for experiments to terminal and stamp INTERN-ARTIFACTS block in JIRA.

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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