test: guard prototype mock data boundaries

frontend/src/features/prototype/mockData.test.ts

@@ -20,7 +20,11 @@ describe('Stage A 演示数据', () => {
   })
 
   it('保持可信边界和引用完整性', () => {
-    expect(mcpTools.filter((tool) => tool.access_mode === 'write').every((tool) => tool.requires_human_confirm)).toBe(true)
+    const writeTools = mcpTools.filter((tool) => tool.access_mode === 'write')
+
+    expect(writeTools.length).toBeGreaterThan(0)
+    expect(writeTools.every((tool) => tool.requires_human_confirm)).toBe(true)
+    expect(knowledgeReferences.length).toBeGreaterThan(0)
     expect(knowledgeReferences.every((reference) => reference.score >= 0 && reference.score <= 1)).toBe(true)
   })
 })