dsh-light-need: Lighting Requirements Reference

The DeepSeek Harness plugin `dsh-light-need` provides agents with references for local lighting parameters. It is implemented in pure Node.js and requires no internet connection. After installing it with the `dsh plugin add` command, call the `light_need` tool in a session to obtain clear lighting recommendations. It is suitable for offline environments, is released under the MIT License, and users should pay attention to the security of its code sources.