simplify catalog __init__.py imports

Author: edwardchalstrey1

src/pygambit/catalog/__init__.py

@@ -1,22 +1,9 @@
-from . import catalog
-from .catalog import games
+from .catalog import CatalogGame, games
 
-# Ensure catalog module is fully imported including all YAML-generated classes
-_all_catalog_classes = games()
-_all_catalog_classes.append("CatalogGame")  # Ensure base class is included
+__all__ = ["games", "CatalogGame"]
 
-_game_classes = {}
 
-for game_name in _all_catalog_classes:
-    try:
-        _game_classes[game_name] = getattr(catalog, game_name)
-    except AttributeError as e:
-        raise ImportError(
-            f"Catalog game '{game_name}' listed but not found in catalog module"
-        ) from e
-
-# Add to module namespace
-globals().update(_game_classes)
-
-# Build __all__ dynamically
-__all__ = ["games", *list(_all_catalog_classes)]
+def __getattr__(name: str):
+    """Lazy load catalog games on access."""
+    from . import catalog as _catalog_module
+    return getattr(_catalog_module, name)