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, sync local copies, and figure out what changed. This Skill automates the entire upgrade flow. ## Core Features & Use Cases - Install Detection: Automatically detects global-git, local-git, vendored, and vendored-global install types and applies the correct upgrade strategy. - Safe Upgrade Flow: Stashes local changes, backs up vendored copies, runs version migrations, and restores from backup if setup fails. - Update Preferences: Supports auto-upgrade mode, snoozing reminders with escalating backoff, and disabling update checks entirely. - Use Case: A developer sees an UPGRADE_AVAILABLE notice, runs the upgrade, and gets a concise summary of what changed between their old version and the new release, with any local vendored copy synced automatically. ## Quick Start Ask the assistant to upgrade gstack to the latest version and show what is new.