Re-running the installer is how a nano host updates. That re-run reset
FELIS_NANO_LISTEN to 127.0.0.1:8081, so a proxy on another machine lost
its endpoint and every login through it failed. It also offered the
full control plane as the default, which on a nano host means k3s and
Postgres nobody asked for.
The listen address is now settled by resolve_nano_listen, the first
step of main, so the later checks see the result. The operator's value
wins, then the -listen argument of the installed felis-nano unit, then
loopback. The install mode defaults to nano, at the prompt and without
a terminal, when the felis-nano unit exists and the full install's
bootstrap.done marker does not. Only the full install writes that
marker.
The harness reads back the unit it wrote earlier, and checks the mode
default on a nano-only host, a host with the full install, and a fresh
host.
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