/**
 * AMT well-known UDP port (RFC 7450 §4).
 *
 * The single definition for the whole repo. It lives here, in the one package
 * both `@blockcast/mmt-transport` and `@blockcast/mmt-container` already
 * depend on, because the two apply it on opposite sides of a boundary that
 * does not otherwise share code:
 *
 * - container resolves it where `networkSource` semantics live, so a catalog
 *   relay that names no port is reachable instead of handing a join a
 *   portless relay that fails.
 * - transport applies it when reading a catalog, dialling a gateway, and
 *   answering DRIAD — but deliberately not at every boundary. Which call
 *   sites do and do not take the default is transport's business; the
 *   reasoning lives beside those call sites, not here.
 */
export const DEFAULT_AMT_RELAY_PORT = 2268;