chore: import upstream snapshot with attribution

examples/v2/docs/introduction.mdx

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+---
+title: CopilotKit VNext Documentation
+description: "CopilotKit VNext Documentation"
+---
+
+## API Reference
+
+### Core
+
+<Card title="CopilotKitCore" icon="code" href="/reference/copilotkit-core">
+  Core CopilotKit class
+</Card>
+
+<Card title="CopilotRuntime" icon="server" href="/reference/copilot-runtime">
+  Host agents and expose runtime endpoints
+</Card>
+
+<Card
+  title="ProxiedCopilotRuntimeAgent"
+  icon="server"
+  href="/reference/proxied-copilot-runtime-agent"
+>
+  Proxied runtime agent for CopilotKit
+</Card>
+
+<Card title="FrontendTool" icon="wrench" href="/reference/frontend-tool">
+  Frontend tool utilities
+</Card>
+
+### React
+
+#### Providers
+
+<Card
+  title="CopilotKitProvider"
+  icon="layer-group"
+  href="/reference/copilotkit-provider"
+>
+  Main provider for CopilotKit React integration
+</Card>
+
+<Card
+  title="CopilotChatConfigurationProvider"
+  icon="cog"
+  href="/reference/copilot-chat-configuration-provider"
+>
+  Configuration provider for CopilotChat
+</Card>
+
+#### Components
+
+<Card title="CopilotChat" icon="comments" href="/reference/copilot-chat">
+  Chat component for CopilotKit
+</Card>
+
+#### Hooks
+
+<Card title="useCopilotKit" icon="link" href="/reference/use-copilotkit">
+  Main hook for CopilotKit functionality
+</Card>
+
+<Card title="useAgent" icon="robot" href="/reference/use-agent">
+  Hook for agent interactions
+</Card>
+
+<Card
+  title="useAgentContext"
+  icon="square-check"
+  href="/reference/use-agent-context"
+>
+  Hook for agent context management
+</Card>
+
+<Card title="useFrontendTool" icon="hammer" href="/reference/use-frontend-tool">
+  Hook for frontend tools
+</Card>
+
+<Card
+  title="useHumanInTheLoop"
+  icon="user-check"
+  href="/reference/use-human-in-the-loop"
+>
+  Hook for human-in-the-loop functionality
+</Card>
+
+<Card
+  title="useRenderToolCall"
+  icon="paintbrush"
+  href="/reference/use-render-tool-call"
+>
+  Hook for rendering tool calls
+</Card>