annotate_compounds      Annotate CAS numbers with chemical information
batch_process_gcms      Batch process GC-MS TXT files in a directory
                        with sample name mapping
build_cas_abundance     Build a CAS × Sample abundance matrix from
                        extracted peak areas
extract_peak_areas      Extract CAS and total peak areas from GC-MS
                        results
filter_by_frequency     Filter compounds by occurrence frequency across
                        samples and treatment groups
process_gcms_txt        Parse a single GC-MS exported TXT file
save_gcms_results       Save GC-MS parsing results to CSV or Excel
                        files
save_postvocs_results   Save postvocs results to CSV or Excel files
