feat(workflow): add pytest Github Actions workflow

[qjrm1430]

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📝 Summary

📄 Description

This PR introduces a new pytest.yml GitHub Actions workflow to automate test execution.

swj9707:feat/pytest-workflow

🔗 Issue / Dependencies / Mentions

• Issue:
• Dependencies:
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✅ Local Checks

• uv run ruff check . passed
• uv run pytest -q passed