fix(acms): add missing step definitions for singular result and entries count in traversal tests

Add three missing Behave step definitions to acms_index_data_model_traversal_steps.py:
- "I should get {count:d} result" (singular form, used in tier-level query scenario)
- "I should get {count:d} entries" (used in get-all-entries scenario)

features/steps/acms_index_data_model_traversal_steps.py

@@ -173,6 +173,18 @@ def step_check_query_result_count(context, count):
     assert len(context.query_results) == count
 
 
+@then("I should get {count:d} result")
+def step_check_query_result_count_singular(context, count):
+    """Verify the query returned the expected number of results (singular form)."""
+    assert len(context.query_results) == count
+
+
+@then("I should get {count:d} entries")
+def step_check_query_entries_count(context, count):
+    """Verify the query returned the expected number of entries."""
+    assert len(context.query_results) == count
+
+
 @then('the results should include "{path}"')
 def step_check_result_includes_path(context, path):
     """Verify the query results include a specific path."""