dsh-inst-pick: Traditional Instrument Selection Solution

`dsh-inst-pick` is an open-source plugin for DeepSeek Harness (DSH), maintained by `uckkk`. The plugin focuses on locally generating learning plans for ethnic instruments, without relying on external network requests, and is implemented purely in Node. By registering the `inst_pick` tool, it returns the appropriate learning plan based on the provided parameters. The installation command is `dsh plugin add github:uckkk/dsh-inst-pick`, and users must meet the version requirements for `@deepseek-ai/cordis` and `@deepseek-ai/dsh-tools` before using it.