fix: update unit test expectations for set_page_label normalization

The test_set_page_label_valid_config test was expecting the old behavior
where open-ended page ranges would get 'end: -1' added automatically.
Updated to match the new implementation where 'end' is only included
if explicitly provided in the input.

Author: jdrhyne

tests/unit/test_client.py

@@ -159,10 +159,10 @@ def test_set_page_label_valid_config():
 
         result = client.set_page_label("test.pdf", labels)
 
-        # Expected normalized labels (implementation adds 'end': -1 when missing)
+        # Expected normalized labels (implementation only includes 'end' if explicitly provided)
         expected_normalized_labels = [
             {"pages": {"start": 0, "end": 3}, "label": "Introduction"},
-            {"pages": {"start": 3, "end": -1}, "label": "Content"},
+            {"pages": {"start": 3}, "label": "Content"},  # No 'end' means to end of document
         ]
 
         # Verify the API call was made with correct parameters