Method handle_generic_run

app/server/runtime.cpp:688–697

    case ArtifactKind::TranscriptAlignment: return "transcript_alignment";
    case ArtifactKind::DiarizationState: return "diarization_state";
    case ArtifactKind::VadState: return "vad_state";
    case ArtifactKind::Custom: return "custom";
    }
    return "custom";
}

double require_ttft_ms(const std::optional<double> & ttft_ms) {
    if (!ttft_ms.has_value()) {
        throw std::runtime_error("streaming response produced no TTFT event");
    }
    return *ttft_ms;
}