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 vendored 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 upgrades each appropriately. - Safe Upgrade with Rollback: Backs up vendored installs before replacing them and restores from backup if setup fails. - Update Prompts & Snoozing: Supports auto-upgrade mode, escalating snooze backoff (24h, 48h, 1 week), and permanent opt-out via config. - Vendored Copy Sync: Detects and updates stale local vendored copies in the current repository after upgrading the primary install. - Use Case: A user runs /gstack-upgrade, the Skill detects a vendored install, clones the latest release, runs setup, syncs the local copy, and shows a summarized "What's New" from the changelog. ## Quick Start Ask the assistant to upgrade gstack to the latest version and show what changed.