[QA] ✅ VERIFICATION PASSED All acceptance criteria met: ✅ Component renders correctly - Verified in browser via chrome-devtools ✅ Can select effort level - Click interactions tested, onChange events captured ✅ Tooltips show appropriate information - All three tooltips verified ✅ Storybook stories cover all states - 8 stories created (default, controlled, all selections, disabled states) ✅ Unit tests pass - 19/19 tests passed in 119ms ✅ Follows design system conventions - Proper use of design tokens, molecule pattern, accessibility Browser testing confirmed: - All radio buttons render and are interactive - Disabled state works correctly (all buttons become disabled) - No console errors or warnings - Proper ARIA attributes for accessibility Complete QA report: /tmp/qa-PPLX-64.md

## Implementation Complete ### What was done: 1. Created `src/src/components/molecules/ReasoningEffortSelector/` with all required files: - `ReasoningEffortSelector.tsx` - Main component - `ReasoningEffortSelector.test.tsx` - Unit tests (19 tests, all passing) - `ReasoningEffortSelector.stories.tsx` - Storybook stories - `index.ts` - Barrel export 2. Added 'info' icon to Icon component (`src/src/components/atoms/Icon/Icon.tsx:731-742`) 3. Component features: - Three effort levels: Fast (low), Balanced (medium), Thorough (high) - Info icon with tooltip next to each option explaining token/cost implications - Props: value ('low'|'medium'|'high'), onChange, disabled, className - Full accessibility support with aria-labels and hidden descriptions ### Tooltips: - **Fast**: "Faster answers, reduced token usage (~50% less)" - **Balanced**: "Default setting, balanced thoroughness and speed" - **Thorough**: "Most comprehensive analysis (~100% more tokens)" ### Verification: - All 19 unit tests pass with vitest - Storybook builds successfully - TypeScript compiles without errors - Component exported from molecules index ### Files changed: - `src/src/components/atoms/Icon/Icon.tsx` (added info icon) - `src/src/components/molecules/index.ts` (added export) - `src/src/components/molecules/ReasoningEffortSelector/` (new directory with 4 files)