In CDP-attach mode (the default since 0.24.0-fork.1), --headed has no
effect — the user's existing Chrome is already visible, and the
generic "use 'agent-browser close' first to restart" advice doesn't
help (the new daemon attaches right back). Explicitly say --headed is
moot and point to --launch as the actual escape hatch.
Other ignored flags (--profile, --proxy, etc.) keep the existing
"close + reopen" message because for those it IS the right advice.