BEFORE — Linux, built real T3 server, fresh isolated home
Non-loopback listener owns TCP port 23773; loopback is free.
Managed IPC startup; no explicit host or LAN setting.

Server startup output (relevant lines):
[09:37:06.238] ERROR (#2): ServeError: 
  [cause]: Error: listen EADDRINUSE: address already in use 0.0.0.0:23773

No runtime metadata written. Server exited: {"code":1,"signal":null}