Paste the URL→locale map for one page cluster. Emits the full <link rel=alternate hreflang=> block to drop into every page's <head>, the sitemap.xml <xhtml:link> variant for sites with many locales, and the per-page HTTP Link header form for PDFs/non-HTML. Self-referential, bidirectional, x-default-ready.
One line per locale. Format: hreflang-tag | absolute-URL. Use x-default for the fallback.