Considering the harness needs to be running how else would this work?

Pretty easy these days with old school tools like tmux but more modern tooling like herdr [0] is really the path you'd want to take.

[0] https://herdr.dev/

Codex remote control serve can run continuously.

Sometimes start a new chat in the phone app, sometimes just add to the main one. Both seem to work ok.

If I want the agent to wait for something I need to start a new chat in the iphone app.