refactor: Update pytest fixtures to follow project conventions

- Add name= argument to all @pytest.fixture decorators
- Rename fixture functions to start with fixture_ prefix
- Add precise return type hints (AsyncMock, Mock, AutoMemoryWrapperGraph)
- Follow <CHORUS_TAG>pytest.fixture</CHORUS_TAG>(name="...") convention

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
Signed-off-by: jackaldenryan <jackaldenryan@gmail.com>

Author: jackaldenryan

tests/nat/agent/test_auto_memory_wrapper.py

@@ -35,17 +35,17 @@
 from nat.memory.models import MemoryItem
 
 
-@pytest.fixture
-def mock_memory_editor():
+@pytest.fixture(name="mock_memory_editor")
+def fixture_mock_memory_editor() -> AsyncMock:
     """Create a mock MemoryEditor for testing."""
     editor = AsyncMock()
     editor.add_items = AsyncMock()
     editor.search = AsyncMock(return_value=[])
     return editor
 
 
-@pytest.fixture
-def mock_inner_agent():
+@pytest.fixture(name="mock_inner_agent")
+def fixture_mock_inner_agent() -> Mock:
     """Create a mock inner agent function for testing."""
     mock_fn = Mock()
 
@@ -65,17 +65,17 @@ async def _ainvoke(chat_request: ChatRequest):
     return mock_fn
 
 
-@pytest.fixture
-def mock_context():
+@pytest.fixture(name="mock_context")
+def fixture_mock_context() -> Mock:
     """Create a mock Context for testing."""
     context = Mock(spec=Context)
     context.user_manager = None
     context.metadata = None
     return context
 
 
-@pytest.fixture
-def wrapper_graph(mock_inner_agent, mock_memory_editor, mock_context):
+@pytest.fixture(name="wrapper_graph")
+def fixture_wrapper_graph(mock_inner_agent, mock_memory_editor, mock_context) -> AutoMemoryWrapperGraph:
     """Create an AutoMemoryWrapperGraph instance for testing."""
     with patch('nat.agent.auto_memory_wrapper.agent.Context.get', return_value=mock_context):
         return AutoMemoryWrapperGraph(inner_agent_fn=mock_inner_agent,