按真实返回屏幕继续处理，别猜原图是否被覆盖

{
  "inputRows": [
    {
      "region": "date",
      "before": "one column",
      "requested": "two columns"
    },
    {
      "region": "name",
      "text": "姓名",
      "requested": "preserve"
    },
    {
      "region": "submit",
      "text": "确认预约",
      "requested": "preserve"
    }
  ],
  "referenceRows": [
    {
      "check": "date layout",
      "expected": "two columns"
    },
    {
      "check": "name/submit text",
      "expected": "unchanged"
    },
    {
      "check": "artifact identity",
      "expected": "actual returned Screen"
    }
  ],
  "invalidRows": [
    {
      "afterSource": "old screen screenshot",
      "error": "not evidence of edit"
    },
    {
      "assumption": "screenId always increases",
      "error": "undocumented identity behavior"
    }
  ],
  "notes": [
    "全部输入为作者自制教学资料，不含真实客户或账号。",
    "referenceRows是校验基准，不是目标模型预测或识别结果；targetProduct=not_run。"
  ],
  "files": {
    "input.json": "[\n  {\n    \"region\": \"date\",\n    \"before\": \"one column\",\n    \"requested\": \"two columns\"\n  },\n  {\n    \"region\": \"name\",\n    \"text\": \"姓名\",\n    \"requested\": \"preserve\"\n  },\n  {\n    \"region\": \"submit\",\n    \"text\": \"确认预约\",\n    \"requested\": \"preserve\"\n  }\n]\n",
    "reference.json": "{\n  \"identity\": \"作者验收参考，非模型返回\",\n  \"rows\": [\n    {\n      \"check\": \"date layout\",\n      \"expected\": \"two columns\"\n    },\n    {\n      \"check\": \"name/submit text\",\n      \"expected\": \"unchanged\"\n    },\n    {\n      \"check\": \"artifact identity\",\n      \"expected\": \"actual returned Screen\"\n    }\n  ]\n}\n",
    "invalid.json": "{\n  \"identity\": \"作者构造负例，非实际错误回包\",\n  \"rows\": [\n    {\n      \"afterSource\": \"old screen screenshot\",\n      \"error\": \"not evidence of edit\"\n    },\n    {\n      \"assumption\": \"screenId always increases\",\n      \"error\": \"undocumented identity behavior\"\n    }\n  ]\n}\n",
    "case.md": "# Stitch SDK编辑页面：按真实返回屏幕继续处理，别猜原图是否被覆盖\n\nStitch SDK编辑页面把一次限定修改与返回身份关联。修改后读取返回Screen并对比保留区，不假设原屏幕必定被覆盖，也不假设每次都自动生成新ID。\n\n## 建立修改基线\n\n读取预约页并保存标题、表单字段和原screenId。\n\n本课只改日期区域的排版，其他内容设为保留区。\n\n## 写限定修改提示\n\n要求日期选项改为两列，并明确姓名、电话和提交按钮不变。\n\n不要加入“顺便重新设计整页”等扩大范围的话。\n\n## 调用edit并保存返回\n\n对目标screen调用edit(prompt)，保留实际返回对象。\n\n使用返回Screen继续取图，不凭原ID或递增规则猜结果位置。\n\n## 比较身份关系\n\n记录原screenId与返回screenId，按实际值判断是否相同。\n\n教程不承诺后端一定覆盖或新建，具体行为以本次返回为准。\n\n## 复查保留区\n\n核对姓名、电话、按钮文字和位置，逐项标注是否发生旁带变化。\n\n未授权变化回到本次修改提示或副本处理，不直接接受。\n\n## 读取修改后的资源\n\n用返回Screen的getHtml/getImage取得成对资产。\n\n如果编辑调用失败，不把旧截图命名为after。\n\n## 交付编辑谱系\n\n保存before、请求、实际返回身份和after，形成可追踪链。\n\n生成完成和业务提交功能可用要分开验收。\n\n身份：输入与参考为作者材料；localCli有实测记录时仅证明对应CLI运行，目标云端与模型推理未执行。\n"
  }
}