dsh-led-circuit: Lighting Circuit Calculation Plugin

The DeepSeek Harness plugin `dsh-led-circuit` is a pure Node.js tool designed specifically for lighting circuit calculations. The plugin requires no external network dependencies, and its core feature is the `led_circuit` tool for precise calculation of lighting parameters. Developers can install it with the `dsh plugin add` command and directly invoke the functionality within a session. Before use, ensure the environment meets dependency requirements such as `@deepseek-ai/cordis`. The plugin is open source under the MIT license and is suitable for developers who need to integrate electrical calculation capabilities into agents.