Scores an article against the signals that matter for Google Discover: hero image ≥ 1200 px wide, max-image-preview:large, publish freshness, author E-E-A-T, NewsArticle/BlogPosting schema, and mobile-first bytes.
Enter the canonical article URL. We fetch it with a mobile UA (Discover is mobile-first), inspect the hero image via HTTP HEAD, parse schema, and score 14 Discover-specific signals.