dsh-daily-plan: Daily Practice

The core of DeepSeek Harness (DSH) is “everything is a plugin.” `dsh-daily-plan` is a pure Node.js tool designed for agents to generate daily calligraphy practice plans. Before installation, the version requirements for `@deepseek-ai/cordis` and `@deepseek-ai/dsh-tools` must be met. The installation command is `dsh plugin add github:uckkk/dsh-daily-plan`. After installation, users can directly invoke the `daily_plan` tool within a DSH session to obtain a plan. This plugin is MIT-licensed and runs with the permissions of the DSH process.