With no handler registered, Dolphin shows an alert in a modal MessageBox
on Windows, and the probe waits until someone closes it. A run that hits
an alert then looks like a hang (StarOS EXP-001). The probe now writes the
alert to stderr and exits at once with status 3.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Yaya48andClaude Opus 5.5
61ebfffa97