Validate imported reference graphs and report malformed canvas input

apps/studio/tests/canvas-document.test.mjs

@@ -1,4 +1,5 @@
 import test from 'node:test';
+import {readFileSync} from 'node:fs';
 import assert from 'node:assert/strict';
 import {parseCanvasDocument,deriveNode,connectNodes,removeCanvasNode,referencedNodes,agentTask} from '../src/lib/canvas-document.ts';
 const note={id:'brief',kind:'text',title:'创意简报',text:'清晨的城市',x:20,y:50};
@@ -13,6 +14,7 @@ test('derived image and script nodes preserve directed references across save an
  const restored=parseCanvasDocument(JSON.stringify(deriveNode(next,'picture',{...note,id:'script',kind:'script',operation:'script'})));
  assert.equal(referencedNodes(restored,'picture')[0].id,'brief');assert.equal(referencedNodes(restored,'script')[0].id,'picture');
  assert.throws(()=>connectNodes(restored,'script','brief'),/循环/);
+ assert.throws(()=>parseCanvasDocument({...restored,links:[...restored.links,['script','brief']]}),/循环/);
  const removed=removeCanvasNode(restored,'picture');assert.deepEqual(removed.links,[]);assert.equal(removed.cards.length,2);
 });
 test('agent task captures current referenced content and validates upscale inputs',()=>{
@@ -33,3 +35,7 @@ test('editing an image passes the current image to the external agent',()=>{
  const image={...note,id:'image',kind:'image',instruction:'把背景改为雪夜',image:'data:image/png;base64,AAAA'};
  assert.equal(agentTask({version:1,cards:[image],links:[]},'image').sourceImage,image.image);
 });
+
+test('agent and browser parse the same canvas document contract',()=>{
+ assert.equal(readFileSync(new URL('../src/lib/canvas-document.ts',import.meta.url),'utf8'),readFileSync(new URL('../../waterfall-wiki/src/lib/canvas-document.ts',import.meta.url),'utf8'));
+});