test: implement pytest-vcr for article scraper with zero mocks
- Replace all mocking with pytest-vcr for real HTTP recording
- Add comprehensive test coverage for major news sources
- Test realistic scenarios: paywalls, 404s, successful scraping
- Update dependencies: googlenewsdecoder, nltk, lxml-html-clean
- Fix lint issue: simplify conditional return statement
- Update documentation to reflect testing progress
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Co-Authored-By: Claude <noreply@anthropic.com>
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