test: harden scheduling review boundaries

tests/wf_transport_rpc_http/test_schedules_rpc.py

@@ -308,19 +308,23 @@ async def test_rpc_schedule_occurrences_tied_entries_traverse_once(tmp_path) ->
         )
 
         seen: list[tuple[str, object]] = []
-        cursor: object = None
-        while True:
+        cursor: str | None = None
+        for _ in range(10):
             page = await client.list_schedule_occurrences(
                 schedule_id="s",
                 cursor=cursor,
-                limit=1,  # type: ignore[arg-type]
+                limit=1,
             )
             assert page["total"] == 2
             for row in page["occurrences"]:
                 seen.append((row["kind"], row["checkpoint_id"]))
-            cursor = page["next_cursor"]
-            if cursor is None:
+            next_cursor = page["next_cursor"]
+            if next_cursor is None:
                 break
+            assert next_cursor != cursor
+            cursor = next_cursor
+        else:
+            pytest.fail("occurrence pagination did not terminate")
         assert seen == [("admitted", None), ("interrupted", "run-1.000001")]