bitxeno/dsh-github-picker: Referencing GitHub Issues and PRs in DeepSeek Harness

The `bitxeno/dsh-github-picker` plugin is designed to address the inefficiency of frequently switching interfaces when referencing GitHub repository issues or PRs in the DeepSeek Harness (DSH) Web UI. It integrates with the GitHub CLI, allowing users to search, filter, and insert references directly in the input box. It supports the `@owner/repo#number` or URL format and provides draft scanning as well as scroll-based loading. Installation requires running `dsh plugin --profile web add dsh-github-picker` and restarting the service. It relies on the `gh` CLI for local authentication and supports adjusting timeout and cache duration through a configuration file.