unknownOSC method
Implementation
@override
void unknownOSC(String ps, List<String> pt) {
_handleSemanticPromptOsc(ps, pt);
_handleVsCodeShellIntegrationOsc(ps, pt);
_handleContextSignalOsc(ps, pt);
onPrivateOSC?.call(ps, pt);
if (onUnknownSequence == null) return;
// These OSC families are recognised and acted on above; they only
// reach this fallback dispatch because they share it with genuinely
// unknown OSCs. Reporting them here would be a false positive.
if (ps == '133' || ps == '633' || ps == '3008') return;
_reportUnknownSequence();
}