refactor(stage2): port kept tumbling panes to Operator<NodeId> payloads

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01W7qG9aFyPij5uWsyAJCxDW

Author: zzylol

crates/executor/tests/promql_binary.rs

@@ -394,6 +394,7 @@ fn stored_series_evaluations_support_filters_and_sets() {
                                 },
                             ),
                         },
+                        kept: false,
                         output_state: if id < 2 {
                             ExecutionDataState::INGESTION_SUMMARY
                         } else {

crates/integration-tests/tests/planner_layering_common/mod.rs

@@ -790,7 +790,12 @@ pub fn retention_ms(p: &Physical, node: PhysicalASAPNodeId) -> Option<u64> {
             .dag
             .consumers(node)
             .into_iter()
-            .filter(|&c| matches!(p.dag.payload(c), Operator::ASAP(ASAPOp::SummaryMerge { .. })))
+            .filter(|&c| {
+                matches!(
+                    p.dag.payload(c),
+                    Operator::ASAP(ASAPOp::SummaryMerge { .. })
+                )
+            })
             .map(|merge| p.dag.producers(merge).len() as u64 * window(node))
             .max();
     }