use Codex 5.3 to review template to spec

{{cookiecutter.project_slug}}/tests/test_public.py

@@ -1,13 +1,19 @@
 from __future__ import annotations
 
-from {{ cookiecutter.package_name }} import __version__
-from {{ cookiecutter.package_name }}.config import get_config
+from {{ cookiecutter.package_name }} import __all__, __version__, get_config
+from {{ cookiecutter.package_name }}.config.settings import Settings
 
 
 def test_public_version_is_string() -> None:
     assert isinstance(__version__, str)
 
 
-def test_get_config_defaults() -> None:
+def test_public_exports_include_stable_symbols() -> None:
+    assert set(__all__) >= {"__version__", "get_config", "Settings"}
+
+
+def test_get_config_defaults_shape() -> None:
     settings = get_config()
-    assert settings.greeting == "Hello"
+    assert isinstance(settings, Settings)
+    assert settings.app.greeting == "Hello"
+    assert settings.database.path.endswith("/data.db")