Open-source SEO & GEO audit: a zero-dependency CLI (npx), an agent skill for Claude Code, Cursor, Codex, Gemini & Copilot, 47 SEO prompts and a cited Google/Bing/AI-search knowledge base. Checks robots.txt, sitemaps, canonicals, hreflang, structured data, Core Web Vitals and AI crawlers — then fixes them.