dsh-session-nav: Quick Navigation for DeepSeek Harness Session Conversations

dsh-session-nav is a DeepSeek Harness (DSH) plugin designed to address the pain point of frequently revisiting historical prompts in agent conversations. It provides a list of historical prompts through a floating button on the right, supporting smooth navigation and automatic loading for both in-window and out-of-window prompts. The plugin employs optimizations such as incremental in-memory traversal, persistent indexing, and client-side caching to ensure a smooth experience. After configuring DSH to allow Git-dependent scripts and restarting DSH, users can install and use it via the CLI.