Add workflow infrastructure — ESLint, Prettier, Husky, Vitest, 7 new skills

Phase 1: Session log archived (1096→91 lines), D031 token access convention
Phase 2: ESLint v9 + Prettier + jsx-a11y, initial config and lint fixes
Phase 3: 7 new skills (polish, harden, normalize, clarify, typeset, quieter, adapt)
         + Vercel reference docs, updated audit/review-component refs
Phase 4: Husky + lint-staged pre-commit hooks, preflight updated to 8 checks
Phase 5: Vitest + Testing Library + /write-tests skill

- Badge.tsx colour maps unified to CSS variables (D031)
- 5 empty interface→type alias fixes (Switch, Radio, Divider, IconButton, Link)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/components/atoms/Divider/Divider.tsx

@@ -5,7 +5,7 @@ import type { DividerProps as MuiDividerProps } from '@mui/material/Divider';
 // ─── Types ───────────────────────────────────────────────────────────────────
 
 /** Props for the FA Divider component */
-export interface DividerProps extends MuiDividerProps {}
+export type DividerProps = MuiDividerProps;
 
 // ─── Component ───────────────────────────────────────────────────────────────
 
@@ -31,11 +31,9 @@ export interface DividerProps extends MuiDividerProps {}
  * <Divider variant="inset" />
  * ```
  */
-export const Divider = React.forwardRef<HTMLHRElement, DividerProps>(
-  (props, ref) => {
-    return <MuiDivider ref={ref} {...props} />;
-  },
-);
+export const Divider = React.forwardRef<HTMLHRElement, DividerProps>((props, ref) => {
+  return <MuiDivider ref={ref} {...props} />;
+});
 
 Divider.displayName = 'Divider';
 export default Divider;