[OMNIML-5098] cell_t0_d7

[ChenhanYu]

Draft PR opened by pensieve-intern for OMNIML-5098.

Stage cell_t0_d7 of Epic OMNIML-5095. 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):

INTERN_ARTIFACTS.json:

{
  "sweep_name": "NVIDIA-Nemotron-3-Super-120B-A12B-BF16_mtp_vllm_t0_d7",
  "experiment_id": "cicd_1781406094",
  "experiment_dir": "/lustre/fsw/portfolios/coreai/users/chenhany/experiments/cicd/cicd_1781406094/",
  "AL_qualitative_overall": 3.4496,
  "AL_qualitative_categories": {
    "coding": 3.7389,
    "humanities": 3.2481,
    "math": 3.7233,
    "multilingual": 3.9783,
    "qa": 3.1787,
    "rag": 3.7926,
    "reasoning": 3.6078,
    "roleplay": 2.7911,
    "stem": 3.2983,
    "summarization": 3.5209,
    "writing": 3.0675
  },
  "AL_throughput_32k_overall": 3.5545,
  "AL_throughput_32k_categories": {
    "high_entropy": 2.8901,
    "low_entropy": 4.144,
    "mixed": 3.6512
  }
}

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

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