ci: run tests on Windows in addition to Ubuntu

[nazarli-shabnam]

Summary

• git.py/run.py have explicit Windows codepage handling and cli.py has PowerShell quoting logic (_ps_quote), but CI only ran on ubuntu-latest so none of that was actually exercised.
• Added windows-latest to the test job's OS matrix alongside the existing Python version matrix (os x python-version), and updated the job name to include the OS.

Test plan

• pytest -q / ruff check . / ruff format --check . locally on Windows (this repo's dev machine)
• YAML validated with yaml.safe_load

Closes #19

(Re-opened as a new PR: the original PR #27 was auto-closed by GitHub when main's history was rewritten to correct a contributor's commit attribution — this branch is unchanged.)

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 10959e38-0fcb-4a11-ba29-22c753440b50

📥 Commits

Reviewing files that changed from the base of the PR and between 11a379a and b9ea769.

📒 Files selected for processing (2)

• .github/workflows/ci.yml
• pyproject.toml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ci/add-windows-matrix

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