Website Launch Checker

Runs a one-page pre-launch checklist against a public URL: HTTPS, HTTP status, title, meta description, viewport, Open Graph tags, /favicon.ico, /robots.txt and a sitemap — reusing the same checks as the other checker tools. The sitemap location is not guessable in general, so this tool uses the "Sitemap:" line from robots.txt when one is declared, and only falls back to guessing /sitemap.xml when robots.txt has none — the result always shows which one was actually checked. A "warn" result means the check found something worth a second look, not necessarily a real problem (for example, a missing /favicon.ico is common on sites that declare their icon a different way).