Paul's call: start mode never auto-opens; the agent is alive and opens
the printed URL itself, in-app browser first, then the system opener,
then showing the URL (--open forces the system browser from the script).
The prose now leads with the start/open/wait flow and keeps the blocking
auto-open path for harnesses that can background a shell.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>