- Blog index page (public/blog.html) with dark theme
- Post 1: Why You Need a Screenshot API (~800 words)
- Post 2: Screenshot API Performance & Caching (~600 words)
- Express routes: /blog → /blog.html, /blog/:slug → /blog/:slug.html
- Blog link added to nav and footer on index.html
- Sitemap updated with blog URLs
- Full test coverage (19 new tests, 190 total passing)
