chore: add codecov support

[Lash-L]

We can expand this and modify as needed. But this should get us a basis that is working

[codecov]

Welcome to Codecov 🎉

Once you merge this PR into your default branch, you're all set! Codecov will compare coverage reports and display results in all future pull requests.

ℹ️ You can also turn on project coverage checks and project coverage reporting on Pull Request comment

Thanks for integrating Codecov - We've got you covered ☂️

[Copilot]

Pull request overview

This PR adds codecov integration to enable code coverage tracking for the repository. The changes introduce pytest-cov as a dependency, update the CI workflow to generate and upload coverage reports, and add a codecov badge to the README.

Key changes:

• Added pytest-cov dependency for coverage reporting
• Modified CI workflow to run tests with coverage flags and upload results to codecov
• Added codecov badge to README for visibility

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated no comments.

File	Description
pyproject.toml	Added pytest-cov>=7.0.0 to dev dependencies
uv.lock	Added pytest-cov, coverage, and tomli package entries with version metadata
.github/workflows/ci.yml	Updated pytest command to include coverage flags and added codecov upload step
README.md	Added codecov badge below existing badges

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