dsh-compound-interest: Compound Interest Calculator

DeepSeek Harness (DSH) has introduced the `dsh-compound-interest` plugin, designed to provide local compound interest calculation for financial data analysis. Maintained by `uckkk` and implemented in pure Node.js without network dependencies, the plugin supports precise calculation of compound interest results based on principal, interest rate, and time via the `compound_interest` tool. Installation is straightforward; note that it runs with the current process permissions and is licensed under the MIT License.