Why: establish the authorized task workspace and its initial baseline.
Evidence: preserved precheck receipt in .task/fix-genui-prod-upgrade-followups.md; R0=ccb6dfaa9cdf7e69eb15d7df024dee55f37b8df1.
Impact: task metadata only; the feature workspace starts at ccb6dfaa9c.
Refs: .task/fix-genui-prod-upgrade-followups.md