Copilot CLI update: chronicle, plugins, and fleet mode | GitHub Checkout

GitHub Copilot CLI Product Manager demonstrates three major experimental features: a plugin marketplace for extending CLI capabilities, the /chronicle slash command that enables self-healing prompts by preserving context across sessions, and multi-model support allowing simultaneous execution of Claude Opus 4.6, GPT-5.4, and Gemini 3. The video showcases fleet mode and autopilot for handling massive refactoring tasks autonomously, aimed at developers looking to automate complex code transformation workflows.