tools/compose_music.py synthesises chip instruments and writes FastTracker 2 XM files (editable in MilkyTracker). The title leitmotif runs through all pieces: title, three build tracks, two battle tracks, victory and defeat jingles. Validated with libopenmpt; instrument tuning checked (A4 = 440 Hz). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>