Function require_model_dir

src/framework/audio/utility_api.cpp:20–26

namespace {

std::filesystem::path require_model_dir(const AudioUtilityPaths & paths, const char * name) {
    const auto dir = paths.assets_root / name;
    if (!std::filesystem::is_directory(dir)) {
        throw std::runtime_error("audio utility assets directory is missing: " + dir.string());
    }
    return dir;
}

bool is_wav_file(const std::filesystem::path & path) {
    auto ext = path.extension().string();