Introduction to the dsh-session-messages Plugin

`dsh-session-messages` is a standalone plugin for DeepSeek Harness, designed to improve the efficiency of looking up historical messages. It triggers a message list with `Ctrl+S`, supporting keyboard navigation, search filtering, and jumping to a message with `Enter`. The plugin also provides a viewport strip that displays the current message's clock, usage, and duration in real time. It does not modify the source code and requires Node.js 22.19.0+ and support for specific language packs.