dsh-circuit-plan: Circuit Loop Planning

The DeepSeek Harness plugin `dsh-circuit-plan` is designed specifically for engineering parameter calculations and provides experience-based circuit loop planning capabilities. The plugin is implemented purely in Node.js, has no network dependencies, supports offline operation, and can return precise results based on input parameters. Developers must meet the version requirements for `@deepseek-ai/cordis` and `@deepseek-ai/dsh-tools`; after installation, it can be invoked directly within a conversation. Before installation, the source code should be reviewed to confirm its permissions and behavior.