Extract DIMS to separate dims.py module

- 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

src/dims.py

@@ -0,0 +1,5 @@
+# DIMS constants - which prime factors define harmonic space dimensions
+DIMS_8 = (2, 3, 5, 7, 11, 13, 17, 19)
+DIMS_7 = (2, 3, 5, 7, 11, 13, 17)
+DIMS_5 = (2, 3, 5, 7, 11)
+DIMS_4 = (2, 3, 5, 7)

src/harmonic_space.py

@@ -11,8 +11,9 @@ from typing import Iterator
 
 import networkx as nx
 
-from .pitch import Pitch, DIMS_7
+from .pitch import Pitch
 from .chord import Chord
+from .dims import DIMS_4, DIMS_5, DIMS_7, DIMS_8
 
 
 class HarmonicSpace:

src/io.py

@@ -242,7 +242,7 @@ def save_graph_to_cache(
 def main():
     """Demo: Generate compact sets and build graph."""
     import argparse
-    from .pitch import DIMS_4, DIMS_5, DIMS_7, DIMS_8
+    from .dims import DIMS_4, DIMS_5, DIMS_7, DIMS_8
     from .harmonic_space import HarmonicSpace
     from .graph import PathFinder
 

src/pitch.py

@@ -12,10 +12,7 @@ from math import log
 from operator import add
 from typing import Iterator
 
-DIMS_8 = (2, 3, 5, 7, 11, 13, 17, 19)
-DIMS_7 = (2, 3, 5, 7, 11, 13, 17)
-DIMS_5 = (2, 3, 5, 7, 11)
-DIMS_4 = (2, 3, 5, 7)
+from .dims import DIMS_4, DIMS_5, DIMS_7, DIMS_8
 
 
 class Pitch: