4 · Composition rules

• A cross-link points at the page that answers the question, never at a domain. A domain link is a referral rather than a composition, and it is this family's one recorded defect.
• Every page is served as markdown at the same path, so an agent never has to parse HTML and never has to leave the markdown surface once it arrives.
• Machine-readable where it is cheap: llms.txt, llms-full.txt, and a claim index each site publishes for its own search. This hub syncs from those rather than from anything bespoke.
• The canonical URL is the intent, the link is the reality. A link goes wherever that site is measured to be serving, which is the canonical host once it answers and the project path before it does {{claim:domains-live}} — and the page says which.