Add public repository interfaces and subclassable adapter CRUD API.

Define split JSON and object repository ABCs, promote adapter methods to public CRUD, add example domain repositories, modernize interface stubs, and make the package installable for tests.

Co-authored-by: Cursor <[email protected]>

python_repositories/__init__.py

@@ -1,6 +1,18 @@
 """python_repositories: Unified repository interfaces and adapters."""
 
-from . import adapters
-from . import interfaces
+from .adapters import MinioAdapter, RedisAdapter
+from .interfaces import (
+    ConnectionAwareInterface,
+    ContextAwareInterface,
+    JsonRepositoryInterface,
+    ObjectRepositoryInterface,
+)
 
-__all__ = ["adapters", "interfaces"]
+__all__ = [
+    "ConnectionAwareInterface",
+    "ContextAwareInterface",
+    "JsonRepositoryInterface",
+    "ObjectRepositoryInterface",
+    "RedisAdapter",
+    "MinioAdapter",
+]