chore: import upstream snapshot with attribution

apps/sim/executor/dag/construction/nodes.test.ts

@@ -0,0 +1,46 @@
+/**
+ * @vitest-environment node
+ */
+import { describe, expect, it } from 'vitest'
+import { BlockType } from '@/executor/constants'
+import type { DAG } from '@/executor/dag/builder'
+import { NodeConstructor } from '@/executor/dag/construction/nodes'
+import type { SerializedWorkflow } from '@/serializer/types'
+
+describe('NodeConstructor', () => {
+  it('assigns nested loop nodes to the innermost loop metadata', () => {
+    const dag: DAG = {
+      nodes: new Map(),
+      loopConfigs: new Map([
+        ['outer-loop', { id: 'outer-loop', nodes: ['inner-loop', 'task'], iterations: 1 }],
+        ['inner-loop', { id: 'inner-loop', nodes: ['task'], iterations: 1 }],
+      ]),
+      parallelConfigs: new Map(),
+    }
+    const workflow: SerializedWorkflow = {
+      version: '1',
+      blocks: [
+        {
+          id: 'task',
+          position: { x: 0, y: 0 },
+          config: { tool: '', params: {} },
+          inputs: {},
+          outputs: {},
+          metadata: { id: BlockType.FUNCTION, name: 'Task' },
+          enabled: true,
+        },
+      ],
+      connections: [],
+      loops: {},
+      parallels: {},
+    }
+
+    new NodeConstructor().execute(workflow, dag, new Set(['task']))
+
+    expect(dag.nodes.get('task')?.metadata).toMatchObject({
+      isLoopNode: true,
+      subflowId: 'inner-loop',
+      subflowType: 'loop',
+    })
+  })
+})