dsh-dest-check: Destination List

The DeepSeek Harness (DSH) plugin `dsh-dest-check` is a “destination checklist” tool implemented in pure Node.js, designed to provide agents with localized travel planning solutions without network requests. It depends on `@deepseek-ai/cordis` and `@deepseek-ai/dsh-tools`, and can be called directly after installation. The tool is suitable for agents that need to quickly generate travel plans locally; before use, it is recommended to review the MIT-licensed source code to ensure security.