fix: resolve RAG manager search signature TypeError (#4994)

* fix: resolve RAG manager search signature TypeError and adjust similarity threshold

* fix: revert similarity threshold change to keep PR focused

* test(rag): remove trailing whitespace

---------

Co-authored-by: Alexandre Teixeira <alexandremagteixeira@gmail.com>

tests/test_rag_search_signature.py

@@ -0,0 +1,22 @@
+import unittest
+from unittest.mock import MagicMock, patch
+from src.rag_manager import RAGManager
+
+class TestRAGManagerSearchSignature(unittest.TestCase):
+    @patch('src.rag_manager.VectorRAG')
+    def test_search_signature_accepts_owner(self, mock_vector_rag_class):
+        # Create a mock instance for VectorRAG
+        mock_vector_rag = MagicMock()
+        mock_vector_rag_class.return_value = mock_vector_rag
+
+        # Initialize RAGManager
+        manager = RAGManager()
+
+        # Test call with owner parameter
+        manager.search("test query", k=3, owner="user1")
+
+        # Verify that search was called on the underlying vector_rag with the correct parameters
+        mock_vector_rag.search.assert_called_once_with("test query", 3, owner="user1")
+
+if __name__ == '__main__':
+    unittest.main()