DeepSeek Harness IM Gateway Plugin (dsh-im-gateway)

`dsh-im-gateway` is an open-source plugin for DeepSeek Harness (DSH), designed to address the complexity of integrating multi-channel IM platforms such as WeChat, QQ, and email. Acting as a gateway, it injects external messages into persistent agents and handles reply routing, using hash algorithms to ensure session isolation. The plugin supports multiple integration methods and includes built-in protective mechanisms such as access control, deduplication, and retry limits. It maintains conversational context and handles cross-message logic. Developers need to configure environment dependencies and integrate it using `cordis.patch.yml`, making it suitable for scenarios where an enterprise-grade agent gateway needs to be built within DSH.