initial workflow for CI (pytest)

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[Copilot]

Pull Request Overview

This PR establishes a GitHub Actions CI workflow to automatically run pytest tests on push and pull requests to the main branch. The workflow tests code against Python 3.11 and 3.14 to ensure compatibility across versions.

• Sets up automated testing with pytest for the repository
• Configures matrix testing for Python 3.11 and 3.14
• Installs dependencies from requirements files and runs tests in a virtual environment

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