[OMNIML-4760] synth_support

[ChenhanYu]

Draft PR opened by pensieve-intern for OMNIML-4760.

Stage synth_support of Epic OMNIML-4755. 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-4760 synth_support verification for qwen3-8b found and fixed one task_0 issue in `tools/launcher/examples/Qwen/Qwen3-8B/hf_offline_eagle3.yaml`.

What changed:
- Updated `task_0` data input from missing `/hf-local/modelopt/Speculative-Decoding-Prompt-Samples` to existing `/hf-local/modelopt/Speculative-Decoding-Dataset-v1-Qwen3-8B/default-openai.jsonl`.
- Left the rest of the 4-task monolithic `hf_offline_eagle3.yaml` unchanged.

Verification:
- `task_0.script` is `common/tensorrt_llm/query.sh`.
- `--model <<global_vars.hf_model>>` resolves to `/hf-local/Qwen/Qwen3-8B`.
- `task_0.slurm_config.container` is `nvcr.io/nvidia/tensorrt-llm/release:1.2.0`.
- Cluster validation on cw_dfw succeeded for the fixed task_0 data path: experiment `cicd_1781221901`, Slurm job `12739762`, remote directory `/lustre/fsw/portfolios/coreai/users/chenhany/experiments/cicd/cicd_1781221901/Qwen3-8B_EAGLE3_offline_task0_verify_jsonl_0`.
- Log evidence included successful SSH tunnel/authentication, TensorRT-LLM 1.2.0 container import, Qwen3-8B server health checks, a successful `/v1/chat/completions` request, and loading `1393367` train examples from the Qwen3-8B JSONL data file.

Next:
- Runner should open the single-file PR for human review because this was a task_0 config fix, not verification-only.

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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