'ccs bar' always tried to start its own web-server. With a CCS server
already listening on 127.0.0.1:3000, get-port (probing the unspecified
address, which macOS allows to bind alongside a specific loopback
listener) reported 3000 as free, and the subsequent 127.0.0.1 bind
failed with EADDRINUSE, aborting launch.
Launch now probes candidate ports (bar.json port first, then the
default list) with a short-timeout GET /api/bar/summary and reuses the
first live CCS server it finds; only when none responds does it start a
new server. The get-port probe also passes host 127.0.0.1 so the
availability check matches the actual bind target. Probe failures are
treated as no-server-found and never break launch.
Closes#1500
Tam Nhu Tran
af1a2a0f5d