fix: use correct path to reset RAG manager state between tests

- Fix type error by using correct internal path to _rag_manager
- Split imports for better readability
- Organize imports more clearly

tests/test_tools_rag.py

@@ -2,21 +2,24 @@
 
 from unittest.mock import patch
 
+import gptme.tools._rag_context
+import gptme.tools.rag
 import pytest
 from gptme.message import Message
 from gptme.tools._rag_context import enhance_messages
-from gptme.tools.rag import _HAS_RAG, init as init_rag, rag_index, rag_search
+from gptme.tools.rag import _HAS_RAG
+from gptme.tools.rag import init as init_rag
+from gptme.tools.rag import rag_index, rag_search
 
 
 @pytest.fixture(autouse=True)
 def reset_rag():
     """Reset the RAG manager and init state before and after each test."""
-    import gptme.tools.rag
 
-    gptme.tools.rag.rag_manager = None
+    gptme.tools._rag_context._rag_manager = None
     gptme.tools.rag._init_run = False
     yield
-    gptme.tools.rag.rag_manager = None
+    gptme.tools._rag_context._rag_manager = None
     gptme.tools.rag._init_run = False