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The crawler/sitemap mechanics now live in the repo doc, not just in the commit log: robots.txt is a build-time endpoint that must stay pure ASCII (no charset on a text/plain response means non-ASCII renders as mojibake), the policy is allow-all with enforcement deliberately left to Cloudflare, why writing a real robots.txt demotes Cloudflare's placeholder from replacement to prepend, and that lastmod/hreflang are derived so they must never be hand-authored.