fix: keep teacher runtime prompts within interface boundary

tests/unit/coding-teacher-cloud.test.ts

@@ -407,8 +407,8 @@ it('submits a nonempty proactive check-in without inventing a user message', asy
   f.access.source.messages = [];
   const { body, compiled } = await submitCompiledContext(f, 'check-in');
   expect(compiled.messages.map(message => message.role)).toEqual(['system', 'system']);
-  expect(compiled.messages.at(-1)?.content).toContain('本轮是一次项目进展提醒，不是用户提问');
-  expect(body.query).toContain('仅依据已有证据');
+  expect(compiled.messages.at(-1)?.content).toContain('程序触发的项目进展检查，学生没有在本轮主动提问');
+  expect(body.query).toContain('回应方式遵循当前智能体的云端配置');
 });
 
 it('gives a server-defined friend the same scoped read tools', async () => {