build(test): add pytest-cov for xdist-compatible coverage

[tiran]

Pull Request Description

What

coverage run only instruments the main process. With pytest-xdist, test workers are spawned as separate processes and their coverage is lost. Replace coverage run -m pytest with pytest --cov, which uses pytest-cov to instrument xdist workers correctly.

Why

Follow-up to #1218

• PR follows CONTRIBUTING.md guidelines

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📥 Commits

Reviewing files that changed from the base of the PR and between dbe3a48 and 7bfd36d.

📒 Files selected for processing (1)

• pyproject.toml

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📝 Walkthrough

Walkthrough

pyproject.toml updates the test extras to include pytest-cov and changes the Hatch test script to run python -m pytest with coverage and debug logging options.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly states the main change: adding pytest-cov for xdist-compatible coverage.
Description check	✅ Passed	The description matches the change and explains why pytest-cov replaces coverage run for xdist workers.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[rd4398]

LGTM!

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