Add native LLM core foundation (#24712)

packages/llm/src/route/index.ts

@@ -0,0 +1,26 @@
+export { Route, LLMClient, modelLimits, modelRef } from "./client"
+export type {
+  Route as RouteShape,
+  RouteModelDefaults,
+  RouteModelInput,
+  RouteRoutedModelDefaults,
+  RouteRoutedModelInput,
+  AnyRoute,
+  Interface as LLMClientShape,
+  Service as LLMClientService,
+  ModelRefInput,
+} from "./client"
+export * from "./executor"
+export { Auth } from "./auth"
+export { AuthOptions } from "./auth-options"
+export { Endpoint } from "./endpoint"
+export { Framing } from "./framing"
+export { Protocol } from "./protocol"
+export { HttpTransport, WebSocketExecutor, WebSocketTransport } from "./transport"
+export * as Transport from "./transport"
+export type { Auth as AuthShape, AuthInput, Credential, CredentialError } from "./auth"
+export type { ApiKeyMode, AuthOverride, ProviderAuthOption } from "./auth-options"
+export type { Endpoint as EndpointFn, EndpointInput } from "./endpoint"
+export type { Framing as FramingDef } from "./framing"
+export type { Protocol as ProtocolDef } from "./protocol"
+export type { Transport as TransportDef, TransportRuntime } from "./transport"