- Create src/dims.py with DIMS_4, DIMS_5, DIMS_7, DIMS_8 constants - Update pitch.py to import from dims - Update harmonic_space.py to import from dims - Update io.py to import from dims - Fix circular import issue
- Split monolithic compact_sets.py into modular src/ directory - Add graph caching (pickle + JSON) with --cache-dir option - Add --output-dir, --rebuild-cache, --no-cache CLI options - Default seed is now None (random) instead of 42 - Add .gitignore entries for cache/ and output/