dsh-sidecar: A Sidecar Follow-up and Branching Tool for DeepSeek Harness

`dsh-sidecar` is a persistent sidecar follow-up plugin for DeepSeek Harness. It allows users to create independent child sessions within the main conversation to ask follow-up questions, enabling code validation or exploration of alternatives without interrupting the main thread. The plugin supports follow-up on selected text, freely draggable and resizable windows, yellow highlighting of the original text, and one-click restoration. By recording character offsets, it preserves context precisely. Installation requires Node.js, pnpm, and a specific version of DSH; it is currently in beta.