E2.4.2 Fix brand.yaml footer URLs or restore the files #49

Part of: footer --check --online fails: both footer logo URLs return 404 (E2.4).

Task

Fix brand.yaml footer URLs or restore the files

Subtasks

• Regenerate lock and footer fixtures
• Reconcile with the footer migration in Repair footer logo URLs and safely migrate existing footers #19

Definition of done

• Tests added or updated and CI green
• Docs updated when the command surface or output changes
• No private registry data, local paths or private repository names in fixtures or docs