opencode2dsh: DSH Plugin

`opencode2dsh` is a plugin for DeepSeek Harness (DSH) that addresses the pain point of requiring an API key to call external free models. By adapting to OpenCode Zen's anonymous channel, it enables credential-free, zero-configuration access. Key advantages include a native adapter with no process overhead, request obfuscation to prevent identification, adjustable reasoning intensity, real-time directory and fallback mechanisms, and comprehensive error handling. Users can install it via a command and restart DSH to use it. Installation requires Node.js ≥ 20 and access to designated domains; the plugin runs with the current process permissions, and reviewing the source code before use is recommended.