New component: Questionnaire. Use it to build multi-step question flows, like agents asking follow-up questions. Supports single and multiple choice, freeform answers, skippable and conditional steps, controlled and resumable state, custom progress, bring-your-own validation, full keyboard navigation with answer shortcuts, ssr-ready, accessible and composable. Available for Base UI, Radix, React Aria in all styles. Also available as unstyled headless in shadcn/react.