sitesmith: canvas summary serializer with unit tests

craft/src/utils/canvas-summary.test.ts

@@ -0,0 +1,24 @@
+import { describe, test, expect } from 'vitest';
+import { summarizeCanvas } from './canvas-summary';
+
+const fixture = {
+  ROOT:  { type: { resolvedName: 'Container' }, props: { aiName: 'Page Root', node_id: 'ai-root-1' }, nodes: ['n1','n2'], parent: null },
+  n1:    { type: { resolvedName: 'Heading'   }, props: { aiName: 'Hero Title', node_id: 'ai-hero-1', text: 'Welcome', level: 1, style: { color: '#fff' } }, nodes: [], parent: 'ROOT' },
+  n2:    { type: { resolvedName: 'HtmlBlock' }, props: { aiName: 'Custom Embed', node_id: 'ai-html-1', code: '<div>opaque</div>' }, nodes: [], parent: 'ROOT' },
+};
+
+describe('summarizeCanvas', () => {
+  test('one line per node with id and aiName', () => {
+    const out = summarizeCanvas(fixture as any);
+    expect(out).toContain('Container id=ai-root-1');
+    expect(out).toContain('Heading id=ai-hero-1 name="Hero Title"');
+  });
+  test('excludes style props', () => {
+    expect(summarizeCanvas(fixture as any)).not.toContain('color=');
+  });
+  test('truncates to maxChars', () => {
+    const out = summarizeCanvas(fixture as any, 60);
+    expect(out.length).toBeLessThanOrEqual(60);
+    expect(out).toContain('truncated');
+  });
+});