Function inject

tools/scripts/build-readme.js:120–127

(content, target)

}

function inject(content, target) {
  const s = content.indexOf(target.start);
  const e = content.indexOf(target.end);
  if (s < 0 || e < 0 || e < s) {
    throw new Error(`${path.relative(ROOT, target.file)} 缺少 ${target.start} / ${target.end} 标记，无法注入数字段`);
  }
  return content.slice(0, s + target.start.length) + "\n" + target.block() + "\n" + content.slice(e);
}

// 默认（无参）：保持旧行为，打中文索引块到 stdout
if (!write && !check) {