GitHub Copilot Evolution: GPT-5.5, Desktop App, Billing, CLI, and Agentic Workflows

Desktop app with Agent Merge, usage-based billing backlash, VS Code Agents window, Agent Plugins GA, major outage post-mortem, Copilot in Teams/Slack, and benchmarking on reasoning levels. 24% PR lift from agentic coding tools. New: Microsoft reportedly sets AI token budgets internally, signaling shift from unlimited usage to cost accountability.