The gate call hardcodes python3.12 (mido is installed for 3.12 only, and a gate
that quietly ran on 3.11 would fail the MIDI probes for the wrong reason). But
propagating rc=127 from a missing interpreter would hold a terminal open over
the stage for a reason that has nothing to do with the rig — which is already
up by the time this runs. Report it, name the fix, let the launch stand.