DeepSeek Harness Side-Assistant Dock & Drawer

`dsh-btw-plugin` is a side assistant plugin for DeepSeek Harness (DSH), designed to address the issue of background queries interrupting the main workflow during long-running tasks. It provides a non-blocking `/btw` command and delivers real-time results through a floating panel. Its core features include physically isolated execution, quantum equalizer visualization, smart automatic retries (with exponential backoff), session context awareness, and rich text support. The plugin supports persistent storage of history and is suitable for scenarios requiring parallel handling of technical details and the main task.