A utun tunnel counted as the VPN whenever it was up with a routable
IPv4 address, so idle Tailscale or a tunnel left behind by a
disconnected client became the VPN pane and its probes failed. A
tunnel is now the VPN only while it carries the IPv4 default route in
netstat: an unscoped default row, or both 0/1 and 128.0/1 rows on it.
A default row scoped to a tunnel (flag I) does not count; on the
physical interface it still does, since a VPN holding the default
leaves the physical default scoped. Tests feed netstat text in the
macOS layout through the parser into Select.
Model: opus-5-5
sneak