Milestone 6. Layouts CRUD as JSON under config/layouts/ — GET list, GET/PUT by name (open to every dashboard), DELETE and rename gated by the admin passcode. Layout menu grows 'Save as named layout…' and a 'Load from server' list; loading copies the layout into the browser's own local state, never live-links viewers. Admin page lists, renames and deletes named layouts. Verified with two isolated browser contexts holding different layouts simultaneously. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01RNYUv9EyrGSFmCnmH7WYKH