Add status assertion to create_alternate_key test

Address review feedback: verify that create_alternate_key returns
status="Pending" since newly created keys always start in that state.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: tpellissier

tests/unit/test_tables_operations.py

@@ -323,6 +323,7 @@ def test_create_alternate_key(self):
         self.assertEqual(result.metadata_id, "key-guid-1")
         self.assertEqual(result.schema_name, "new_product_code_key")
         self.assertEqual(result.key_attributes, ["new_productcode"])
+        self.assertEqual(result.status, "Pending")
 
     def test_create_alternate_key_multi_column(self):
         """create_alternate_key() should handle multi-column keys."""