Add pytest test suite with CI and coverage

[GeiserX]

Summary

• Add 29 pytest tests covering entry parsing, URL host validation, badge detection, config loading, alphabetical ordering, and full lint_readme integration
• Add GitHub Actions workflow (.github/workflows/tests.yml) running pytest with codecov upload
• Add requirements-test.txt with pytest and pytest-cov
• Add codecov badge to README

Test plan

• Verify all 29 tests pass in CI
• Confirm codecov badge renders after first CI run

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: a1c6df90-aa6a-4079-a2e1-1032b67db511

📥 Commits

Reviewing files that changed from the base of the PR and between b29ed5b and daa2b4b.

📒 Files selected for processing (6)

• .github/workflows/tests.yml
• .gitignore
• README.md
• requirements-test.txt
• tests/__init__.py
• tests/test_lint.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/add-tests

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