use constants better

README.md

@@ -12,11 +12,11 @@ src/
 ├── config.rs          # GameConfig, TileRegistry resources
 ├── constants.rs       # Tile size, structural constants
 ├── entities/
-│   ├── item/magic_numbers.rs    # Item sprite constants
+│   ├── item/constants.rs    # Item sprite constants
 │   ├── livestock/
 │   ├── sentient/
 │   └── shared_systems/
-│       ├── magic_numbers.rs     # Pathfinding + dig constants
+│       ├── constants.rs     # Pathfinding + dig constants
 │       ├── occupancy.rs
 │       └── pathfinding.rs
 ├── game.rs            # ZIndex resource, frame timing
@@ -24,12 +24,12 @@ src/
 └── world/
     ├── chunks/        # ChunkMap, chunk loading/unloading, connectivity
     ├── generation/
-    │   ├── forestry/magic_numbers.rs  # Tree constants
-    │   ├── terrain/magic_numbers.rs   # Terrain + cave constants
+    │   ├── forestry/constants.rs  # Tree constants
+    │   ├── terrain/constants.rs   # Terrain + cave constants
     │   ├── forestry.rs
     │   └── terrain.rs
     └── tiles/
-        ├── magic_numbers.rs          # A*, benchmark constants
+        ├── constants.rs          # A*, benchmark constants
         ├── chunk_data.rs
         ├── rendering.rs
         ├── tilemap.rs