Start target range from first chord average

- Target now begins at average cents of starting chord
- Progress adds target_octaves on top of starting position
- More accurate register targeting

src/graph.py

@@ -362,8 +362,11 @@ class PathFinder:
         max_path = config.get("max_path", 50)
         target_cents = target_octaves * 1200
 
+        start_avg_cents = sum(p.to_cents() for p in path[0].pitches) / len(
+            path[0].pitches
+        )
         progress = len(path) / max_path
-        current_target = progress * target_cents
+        current_target = start_avg_cents + (progress * target_cents)
 
         current_chord = path[-1]
         current_avg_cents = sum(p.to_cents() for p in current_chord.pitches) / len(