What problem does it solve? UI edits on Hub Pro apps can silently remove frozen DOM elements, break JavaScript bindings, and ship regressions without any audit trail. This Skill enforces a locked, mandatory upgrade process so every HTML/CSS/JS change is classified, verified, and recorded before shipping. ## Core Features & Use Cases - General UP-0 to UP-7 checklist: Classify the surface, acknowledge the first check, inventory the DOM against a frozen baseline, edit additively, run verify and E2E scripts, then append a ledger entry. - Per-app ledgers: Maintains locked upgrade ledgers for Worker Hub, Mac Health, Hub Form, and WTM Tab surfaces, with a registry mapping each surface to its verify and E2E scripts. - Founder glance contract: Enforces UI constraints for founder_glance surfaces such as zero tab bars, one primary CTA, and DOM elements that must stay absent. - Use Case: Before editing the Mac Health dashboard HTML, run the mandatory gate script to print the checklist, confirm the frozen inventory, make additive-only changes, and append a ship summary with founder approval status. ## Quick Start Ask the assistant to run the Hub Pro UI upgrade checklist for the worker_hub surface before making any HTML or CSS changes.