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 safely. ## Core Features & Use Cases - Install Detection: Automatically detects global-git, local-git, vendored, and vendored-global install types and applies the correct upgrade procedure. - Safe Upgrade with Rollback: Backs up the existing install before upgrading and restores from backup if setup fails. - Update Preferences: Supports auto-upgrade mode, snoozing reminders with escalating backoff (24h, 48h, 1 week), and disabling update checks entirely. - Vendored Copy Sync: Detects and updates stale local vendored copies so project-committed installs stay in sync with the global one. - Use Case: A user sees an UPGRADE_AVAILABLE notice while running another gstack skill; this Skill asks for consent, upgrades from v1.0 to v1.1, syncs the vendored copy, and shows a What's New summary. ## Quick Start Ask the assistant to upgrade gstack to the latest version and show what is new.