GitHub Copilot GPT-5.5, Desktop App, Usage-Based Billing, CLI, Remote Control GA

Desktop app with Agent Merge, billing backlash 10x-50x spikes. VS Code 1.133 adds Agents window. MAI-Code-1.1-Flash released. Agent Plugins 1.0 GA. Internal cost discipline narrative continues. New: Grok 4.6 launched on GitHub Copilot, expanding model choice.