function D = load_data(S, name)
%LOAD_DATA  读取 scripts/build_figure_data.py 预先写好的绘图数据并规范化文本字段。
    path = fullfile(S.data_dir, [name '.mat']);
    if ~isfile(path)
        error('缺少绘图数据：%s（请先运行 scripts/build_figure_data.py --prepare）', path);
    end
    D = normalize_text(load(path));
    if isfield(D, 'switch_') && ~isfield(D, 'switch_s')
        D.switch_s = D.switch_;
    end
end