DAG: expose deterministic recompute levels

src/facade/recomputeEngine.ts

@@ -49,6 +49,7 @@ export type RecomputeExecutionResult = {
   status: RecomputeExecutionStatus
   affected: string[]
   order: string[]
+  levels: string[][]
   completed: string[]
   failed: string[]
   skipped: string[]
@@ -116,6 +117,7 @@ export class RecomputeCoordinator {
         status,
         affected: plan.affected,
         order: plan.order,
+        levels: plan.levels,
         completed,
         failed,
         skipped,