function results = load_results_mat(file_path)
%LOAD_RESULTS_MAT Load results struct from a MAT file.

arguments
    file_path (1,:) char
end

if ~exist(file_path, 'file')
    error('load_results_mat:FileNotFound', 'Results file not found: %s', file_path);
end

data = load(file_path, '-mat');
if ~isfield(data, 'results')
    error('load_results_mat:MissingResultsVariable', ...
        'MAT file does not contain variable ''results'': %s', file_path);
end

results = data.results;