Add native LLM core foundation (#24712)

packages/llm/src/index.ts

@@ -0,0 +1,35 @@
+export { LLMClient, modelLimits, modelRef } from "./route/client"
+export { Auth } from "./route/auth"
+export { Provider } from "./provider"
+export type {
+  RouteModelInput,
+  RouteRoutedModelInput,
+  Interface as LLMClientShape,
+  Service as LLMClientService,
+  ModelRefInput,
+} from "./route/client"
+export * from "./schema"
+export { Tool, ToolFailure, toDefinitions, tool } from "./tool"
+export type {
+  AnyExecutableTool,
+  AnyTool,
+  ExecutableTool,
+  ExecutableTools,
+  Tool as ToolShape,
+  ToolExecute,
+  Tools,
+  ToolSchema,
+} from "./tool"
+export type {
+  RunOptions as ToolRunOptions,
+  RuntimeState as ToolRuntimeState,
+  StopCondition as ToolStopCondition,
+  ToolExecution,
+} from "./tool-runtime"
+
+export * as LLM from "./llm"
+export type {
+  Definition as ProviderDefinition,
+  ModelFactory as ProviderModelFactory,
+  ModelOptions as ProviderModelOptions,
+} from "./provider"