dsh-bulb-buy: Light Bulb Selection Plan Generation

The DeepSeek Harness (DSH) plugin `dsh-bulb-buy` provides agents with the `bulb_buy` tool, designed to address the inefficiency of hand-written logic in purchasing tasks. The plugin has no network dependencies and can be invoked directly within a session after installation to generate residential lighting design solutions based on parameters. Developers should ensure that the versions of `@deepseek-ai/cordis` and `@deepseek-ai/dsh-tools` meet the required specifications, and it is recommended to review the source code and license before installation.