dsh-copilot-sdk: Hooking Your GitHub Copilot Subscription into the DeepSeek Harness

dsh-copilot-sdk is a DSH plugin developed by GongYuanCaiJi, ported from @github/copilot-sdk (v1.0.11) under the MIT license. Its core function is to connect an existing GitHub Copilot subscription to DSH by registering it as a copilot provider, without requiring an additional Copilot CLI installation. Users can access models such as gpt-5, claude-sonnet-4.5, and deepseek-r1 through the model selector, with support for streaming output in both chat and reasoning modes, but tool execution is prohibited. Authentication supports GitHub login, Token, or BYOK. The plugin provides /copilot status, /copilot models