dsh-personalization: Defining Long-Term Persona and Rules for DeepSeek Harness

DeepSeek Harness (DSH) has added the `dsh-personalization` plugin, designed to maintain consistency in AI behavior across multiple sessions. The plugin introduces a new “Personalization” settings page, allowing users to centrally manage long-term rules, forms of address, names, and persona descriptions, with all content automatically injected into subsequent tasks. After a single configuration, users can maintain a stable style and response format across all conversations. The plugin configuration is stored locally in `~/.dsh/personalization.json` and takes effect immediately. The installation command is `dsh plugin --profile web add dsh-personalization@1.0.0`, requiring Node.js >= 18.