Clarify .base attribute test comment for memory views

Improved test comment to clearly explain that memory views keep a reference to the owner object to prevent premature garbage collection, without making vague statements about implementation details.

Co-authored-by: jpfeuffer <8102638+jpfeuffer@users.noreply.github.com>

Author: Copilot

tests/test_numpy_vector_converter.py

@@ -74,10 +74,9 @@ def test_const_ref_output_is_readonly_view(self, numpy_vector_module):
         with pytest.raises(ValueError, match="read-only"):
             result[0] = 999.0
 
-        # Check base attribute - should be the C++ object
+        # Check base attribute - should be the C++ object or a memory view wrapper
+        # Memory views keep a reference to the owner to prevent garbage collection
         assert result.base is not None
-        # For memory views, base should reference back to the owning object
-        # The exact type depends on Cython's memory view implementation
 
     @pytest.mark.skip(reason="Mutable ref views require ensuring C++ object lifetime exceeds view lifetime - needs investigation of reference handling")
     def test_mutable_ref_output_is_view(self, numpy_vector_module):