- 添加项目配置文档 (AGENTS.md) - 创建 package.json,包含环信 SDK 及测试依赖 - 添加环信 polyfill 工具模块 - 添加双用户消息互发测试脚本 - 添加 polyfill 测试脚本 Co-Authored-By: Claude <noreply@anthropic.com> Co-Authored-By: Happy <yesreply@happy.engineering>