The landing page spent its strongest on-page signal on the word "Home";
the title now carries the positioning line and the OG title carries the
full brand phrase. /blog on a product subdomain served the personal blog
in dev (vinxi ignores the vercel.json rewrites that protect production),
splitting the brand and crawl equity — subdomain hits now render the
shared 404. /agents, /changelog and /faq join the sitemap registry so
they are indexed as they land.
Tests: bun test (539 pass); vinxi build clean, no new tsc errors.
Issues: FRE-8, FRE-15, FRE-9
Refactor sitemap.xml route to read the Host header, determine the active
site, and produce a sitemap scoped to that site's routes with canonical
URLs. Extracts route definitions and XML generation into shared modules.
