DeepSeek Harness Plugin: dsh-input-polish

`dsh-input-polish` is a dual-sided plugin for DeepSeek Harness (DSH), designed to address the challenge of quickly rewriting or adjusting input style when switching models. It adds a Sparkles button to the Composer toolbar, allowing users to invoke the current model with one click to polish a draft. Users can customize the output style (e.g., concise/formal) and level of detail in the settings panel, and these preferences are persisted automatically. The plugin supports loading-state indicators and failure retries. Installation requires building the Host and Client sides separately and configuring a Profile. Through integrated interactions, it improves the text-editing efficiency of DSH users.