Add bounded screenreader streams, settings, interface undo, readable log formatting, remappable key data, palette certification and bell synthesis. Include the one-line legacy CLI Confirm match needed for a buildable commit. Component milestone only: live settings persistence, event-feed integration and final accessibility signoff remain pending. Verified from an exported index snapshot: affected crate tests, legacy CLI tests, full workspace all-target tests, strict workspace clippy, fmt and all-target check.