generative-ui-london-hackathon-starter

Adds a new A2UI component to the CopilotKit A2UI hackathon starter's shared catalog, end-to-end. Coordinates the 3-surface component dance (TypeScript definition + Zod prop schema, React renderer, agent prompt mirror) so components actually render instead of ending up half-finished. Use when the hacker says "add a widget", "add a component", "scaffold a card", "build me a [domain] visual", "build me a metrics card", "add an A2UI widget", "make a new component", or asks for a new generative-UI surface in this repo. Anchors against the live catalog at `src/a2ui/catalog/definitions.ts`. Enforces the AGENTS.md hard rules — never bump @copilotkit/* versions, always run `pnpm validate-widget` after editing widget JSON, always run `pnpm smoke` before declaring done. Don't use for re-theming (Seam

Render A2UI (Agent-to-UI declarative surfaces) in CopilotKit v2. Enable the runtime via CopilotRuntime({ a2ui: {...} }), then enable the provider via <CopilotKitProvider a2ui={{ theme }}>. Auto-activates via /info — do NOT manually pass renderActivityMessages. createA2UIMessageRenderer ships from @copilotkit/react-core/v2; low-level primitives (A2UIProvider, A2UIRenderer, createCatalog) ship from @copilotkit/a2ui-renderer. Covers theme customization, createSurface dedup, action-bridge try/finally cleanup. Load when an agent emits A2UI operations (createSurface / updateComponents / updateDataModel), when wiring a2ui on CopilotRuntime, or when styling A2UI surfaces.