MARKER_PATH

const MARKER_PATH: "/.well-known/ebitex/mark" = '/.well-known/ebitex/mark'

Borrows the .well-known convention (a namespace browsers/servers already treat as non-content) as a low-collision-risk reserved path — not an IANA-registered suffix, just reusing the convention for its low-collision property. The server reserves the same path, so no Experience node can be published at it.