What problem does it solve? Keeping gstack up to date across global and vendored installs is error-prone: users must detect the install type, run the right upgrade commands, handle failures, and keep local vendored copies in sync. This Skill automates the entire upgrade flow and summarizes what changed. ## Core Features & Use Cases - Install Type Detection: Automatically distinguishes global-git, local-git, vendored, and vendored-global installs and applies the correct upgrade strategy. - Interactive or Automatic Upgrades: Prompts the user with snooze/never-ask options, or upgrades silently when auto-upgrade is enabled, with backup-and-restore recovery on failure. - Vendored Copy Sync: Detects stale local vendored copies and syncs them from the freshly upgraded primary install. - Use Case: A developer sees an UPGRADE_AVAILABLE notice, invokes the upgrade, and gets gstack updated plus a concise "What's new" summary grouped by theme from the changelog. ## Quick Start Ask the assistant to upgrade gstack to the latest version and show what changed.