Add MLflow tracking to modelopt MCP

[ChenhanYu]

Summary

• add optional MLflow run creation to modelopt-mcp submit_job
• pass standard MLFLOW_RUN_ID and MLFLOW_TRACKING_URI into launched jobs
• add MLflow finalization support to fetch terminal Nemo/Slurm logs with nemo experiment logs, upload launcher status/log artifacts, and record pass/fail
• document the launcher workflow and add unit coverage

Testing

• uv run --project tools/mcp pytest tools/mcp/tests/test_bridge.py
• pre-commit hooks during commit: ruff, mypy, markdownlint, bandit, launcher YAML validation

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chenhany/omniml-5438-mcp-mlflow

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.72%. Comparing base (92296ae) to head (e5a9c6e).
⚠️ Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1986      +/-   ##
==========================================
- Coverage   76.42%   73.72%   -2.70%     
==========================================
  Files         520      525       +5     
  Lines       58339    62565    +4226     
==========================================
+ Hits        44587    46128    +1541     
- Misses      13752    16437    +2685     

Flag	Coverage Δ
unit	54.95% <ø> (-0.42%)	⬇️

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