DeepSeek Harness Plugin: dsh-user-agent

The dsh-user-agent plugin standardizes the User-Agent for all outbound HTTP requests in DeepSeek Harness. This MIT-licensed plugin works by overriding the global `fetch` function, enabling it to rewrite API calls, web searches, and tool requests. It provides a dedicated web settings page that supports live editing and persistent storage, with settings applied dynamically at runtime. The default configuration is retained across sessions and follows the standard DSH settings system. After installation, users can enable the feature from the settings page and customize the UA string, making it suitable for scenarios requiring unified request identification or spoofing.