What problem does it solve? Keeping gstack up to date is error-prone when installs exist in multiple locations (global git clone, local git clone, or vendored copies). This Skill automates version detection, upgrade execution, backup/rollback, and changelog summarization so users stay current without manual git operations. ## Core Features & Use Cases - Install Type Detection: Automatically identifies whether gstack is installed as a global git clone, local git clone, or vendored directory, and applies the correct upgrade strategy. - Safe Upgrade with Rollback: Backs up the previous version before upgrading and restores it automatically if the setup step fails. - Vendored Copy Sync: Detects and updates stale local vendored copies so global and project-level installs stay in sync. - Update Preferences: Supports auto-upgrade mode, snoozing reminders with escalating backoff (24h, 48h, 1 week), and disabling update checks entirely. - Use Case: A user runs /gstack-upgrade and the Skill detects a vendored install, clones the latest release, runs setup, syncs the local copy, and shows a summarized "What's New" changelog. ## Quick Start Ask the assistant to upgrade gstack to the latest version and show what changed.