DeepSeek Harness Plugin: Reusing the Local GitHub CLI (gh)

The DeepSeek Harness plugin `dsh-github-cli` allows users to reuse their local GitHub CLI (`gh`) login session, enabling direct execution of GitHub commands in Harness without configuring a new token or OAuth. It adopts a read-first security policy, denying sensitive commands by default and only permitting operations through a command allowlist. Installation requires running the `dsh` command and restarting the process, and the plugin provides the `gh_cli_run` and `gh_auth_status` tools.