Agent rule
Never add a root /index.html — route every hostname explicitly in vercel.json.
Status: Accepted
Context: One catch-all homepage hijacks every domain in a multi-product repo. Agents love creating index.html at the root unless you forbid it.
Decision: Omit root /index.html. Use host-based rewrites in vercel.json to route each domain to the correct subtree.
Consequences: Deploy and routing logic stay in vercel.json. See DEPLOY.md. Agent checks rewrites before adding pages.