- doctor printed OPENAI_BASE_URL raw, the third place a credential-bearing URL
reached the terminal; it goes through _endpoint like the others.
- dev.run left its output readers unjoined, so a child's last lines could be
lost on exit. The threads are kept and joined during teardown.
- logs read each file and then reopened it to follow, so anything written in
between appeared in neither. One handle now serves both.
- dev took --port straight from argparse: 0 would have served on an ephemeral
port while printing 0, and oversized values reach socket.bind. It goes
through _port_number first.
- doctor --redis-url overrode only the broker, so a stale result backend or
cache was still pinged and the flag looked broken. All three endpoints now
come from the URL given.