🚨 Fix linter errors/warnings; adjust ruff configuration

src/marshmallow_generic/__init__.py

@@ -16,5 +16,8 @@ limitations under the License."""
 __version__ = "0.0.1"
 
 __doc__ = """
-PLACEHOLDER
+Generic schema with full typing support and minimal boilerplate.
 """
+
+from .decorators import post_load
+from .schema import GenericSchema

src/marshmallow_generic/decorators.py

@@ -1,3 +1,5 @@
+"""Typed overloads for some of the `marshmallow.decorators` module."""
+
 from collections.abc import Callable
 from typing import Any, Optional, TypeVar, overload
 from typing_extensions import ParamSpec