Copilot in VS Code gives each agent session its own git worktree

GitHub's Copilot July 2026 release notes for VS Code cover versions 1.127 through 1.131 and land a redesigned Agents window that can start a Copilot, Claude, or Codex session in an isolated git worktree, plus multi-chat inside one session and a bang-prefix that runs the chat line as a terminal command. Copilot vision is now generally available.