Reference catalog for WCAG 2.2 keyboard-navigation conformance - covers SC 2.1.1 (Keyboard), 2.1.2 (No Keyboard Trap), 2.1.4 (Character Key Shortcuts), 2.4.3 (Focus Order), 2.4.7 (Focus Visible), 2.4.11/2.4.12 (Focus Not Obscured) - with conformance levels (A/AA), test scripts, and per-criterion failure patterns, plus the modal focus-trap / focus-management pattern (focus-on-open, Tab-cycle, inert, Escape-closes, restore-to-trigger, native `<dialog>`) in references/. Use when authoring or reviewing keyboard-only interaction support, or a modal / drawer / popover's focus management.