dsh-convmap: Conversation Map Plugin

`dsh-convmap` is a web plugin for DeepSeek Harness (DSH) designed to address navigation difficulties in long conversations. The plugin renders full turn ticks along the left edge of the conversation area, offering hover previews, click-to-jump, and scroll highlighting. Its key features include: support for full log reading and agent self-run turn generation; optimized performance with support for hundreds of ticks and gradient expansion; keyboard support and a non-intrusive design. The plugin works by coordinating raw log reading on the Host side with component mounting on the Client side, and developers can deploy it quickly using an installation script.