dsh-log-any: Arbitrary-Base Logarithm Calculator Plugin

The `dsh-log-any` plugin from DeepSeek Harness (DSH) aims to lower the barrier to agent development through modular components. Focused on arbitrary-base logarithm calculations, it is implemented in pure Node.js and makes no network requests. Users can install it with the official command and directly invoke its registered tool within a session. The tool runs with the permissions of the current process; users are advised to review the source code and license before installing.