docs(harness): refresh protocol harness

fix(wecom): add image download diagnostics

feat(wecom): support quoted media and resource aeskey decryption

docs(harness): add project harness

feat(wecom-doc-sync): add doc_id auto-resolution fallback for path-based URLs

【docs】更新企业微信接入文档

【wecom】增加长连接模式支持

fix: return finish=true for orphaned streams after restart

feat: 添加协议层图片自动下载解密功能

update handle mixed text+image messages in echo example

update image reply with encrypted media decryption

docs: 重写 README 为 GitHub 风格

refactor: reorganize to pkg/wecom structure with example

feat: initial commit - WeCom protocol implementation