GitLab Duo CLI: Agentic AI now in the terminal

Introduces GitLab Duo CLI, a new command-line interface that extends the agentic AI capabilities of the GitLab Duo Agent Platform to the terminal. It supports both interactive (human-in-the-loop) and headless (automated workflows, CI/CD integration) modes. Highlights security features like prompt injection detection and composite identity. Details installation via GLab or as a standalone tool. Emphasizes the CLI's composability and debuggability for automation and scripting.