chore(pl): guard arrange path against dibang revoke rebuild

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/tests/test_pl_dibang_upsert_on_arrange.py

@@ -639,3 +639,11 @@ def test_upsert_remounts_monthly_plan_when_partner_changes(
     assert inventory.plan_no == "SX-NEW"
     mock_find_plan.assert_called()
     mock_create_plan.assert_not_called()
+
+
+def test_arrange_transport_source_has_no_revoke_call():
+    import inspect
+    from app.api.pl import transport as transport_api
+
+    src = inspect.getsource(transport_api.arrange_transport)
+    assert "revoke_regeneratable_dibang_for_transport" not in src