dsh-average: Average Calculation Tool

The DeepSeek Harness (DSH) plugin `dsh-average` is designed specifically for locally calculating averages. Maintained by user `istone`, the plugin is implemented in pure Node.js, does not rely on network interfaces, and runs directly locally. The installation command is `dsh plugin add github:uckkk/dsh-average`. Once enabled, it registers a calculation tool in the session, making it suitable for data-processing scenarios that do not require internet access. Before use, it is recommended to review its MIT license and source code.