Hosted on GitHub Pages (not Vercel) because Google Search Console’s sitemap fetcher has repeatedly failed to parse byte-identical XML served from Vercel edge (Last read set + “Sitemap could not be read”).
Canonical GSC URL: https://sitemap.smartkid.cc/sitemap.xml
Regenerate from production: curl -sL https://smartkid.cc/sitemaps/public -o sitemap.xml