DeepSeek Harness v0.2.1-alpha.2 adds reasoning translation and Git Worktrees

DeepSeek released pre-release v0.2.1-alpha.2 of its open-source agent runtime DeepSeek Harness. It adds experimental plugins for machine-translating model reasoning (Bing, Google, DeepSeek Flash) and Git Worktrees for parallel agent work, plus session state-record APIs and SDK tools.

• Experimental plugin translates model reasoning via Bing, Google or DeepSeek Flash
• Git Worktrees plugin gives an agent a separate Git checkout for parallel work
• New working_directory tool and matching TypeScript and Python SDK APIs
• Breaking changes: both tool-presentation mode removed, subagents return child ID immediately