ci: add Codecov coverage upload

[JohnRDOrazio]

Summary

• Adds --cov-report=xml to the pytest step to generate coverage.xml
• Uploads the report to Codecov using codecov/codecov-action@v5
• Uses tokenless upload (public repo, Codecov app already enabled)

Test plan

• CI passes and coverage appears on Codecov dashboard

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 5dc4c97e-8e4f-469b-8c95-e51c8ae441d2

📥 Commits

Reviewing files that changed from the base of the PR and between 619f27c and ed46fe1.

📒 Files selected for processing (1)

• .github/workflows/release.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/codecov-ci

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[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 ☂️