summary_nano printed the node's primary IP for every non-loopback bind
and 127.0.0.1 for every loopback one. A bind to a second private
address, or to [::1], handed the operator a hasJoined URL that nothing
listens on.
The host is now the part of FELIS_NANO_LISTEN before the last ':'. The
node's IP is used only for a wildcard bind (empty, 0.0.0.0 or [::]),
which names no address a proxy could dial. The loopback and
public-bind notes are unchanged.