nano_listen_is_loopback decides whether configure_nano_firewall opens
the port, and hasJoined takes no token. A default that does not
classify as loopback would make every fresh nano host a public auth
relay.
The harness now runs the classifier on four loopback binds and three
routable ones, and feeds it the default resolve_nano_listen applies on
a first install, with no operator value and no existing unit. Setting
that default to 0.0.0.0:8081 or :8081, or counting 0.0.0.0 as
loopback, now fails the harness. Test only.
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