control-board serve.test: the non-loopback refusal test took a port from a
probe-and-close helper and then called startServer on it. It now binds its
own listener, keeps it for the whole test, and closes it in finally, so the
port cannot be taken by another process in between.
stack-release.test T-I4: the free port goes only to webui-service.sh install
rows that refuse before any listen, so it is now a closed lease
(leaseClosedPort), which refuses connects and blocks other binds.
The 22 other freePort callers hand the number to `stack-release.sh rehearse`,
which probes it and starts a Console later. That needs a script change and
is left as a design, with a comment above freePort naming the window.
jason.woltje
5fbf3d2b51