ci: add CLI smoke test workflow

[Metric35]

Adds a lightweight GitHub Actions workflow that installs dependencies and runs cli.py help as a smoke test.

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Note

Introduces a lightweight CI check to validate the Python CLI entrypoint builds and shows help.

• Adds .github/workflows/cli-smoke-test.yml triggered on pull_request changes to agents/**, scripts/**, requirements.txt, or the workflow file
• Sets up Python 3.10, installs requirements.txt, and runs python scripts/python/cli.py --help with PYTHONPATH=.

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