agents: add AI SDK module exports

Export public API for the AI SDK engine module.

src/agents/aisdk/index.ts

@@ -0,0 +1,56 @@
+/**
+ * AI SDK v6 integration for openclaw.
+ *
+ * This module provides an alternative LLM engine using Vercel's AI SDK,
+ * alongside the existing pi-agent implementation. Users can choose between
+ * engines via configuration.
+ *
+ * Fork-friendly design:
+ * - All AI SDK code lives in this separate `aisdk/` directory
+ * - Original pi-agent code remains untouched
+ * - Minimal integration points for easy upstream merges
+ */
+
+// Types
+export type {
+  AiSdkConfig,
+  AiSdkMessage,
+  AiSdkMessageContent,
+  AiSdkStreamInput,
+  AiSdkTool,
+  DirectProviderId,
+  DirectProviderConfig,
+  GatewayConfig,
+  ModelRef,
+  ProviderMode,
+  ResolvedModel,
+} from "./types.js";
+
+// Provider management
+export {
+  getDefaultConfig,
+  listAvailableProviders,
+  parseModelRef,
+  resolveModel,
+  validateConfig,
+} from "./provider.js";
+
+// Tool conversion
+export type { ConvertedAiSdkTool, ToolExecutionContext, ToolResult } from "./tools.js";
+export { convertPiToolToAiSdk, convertPiToolsToAiSdk, createAiSdkTools } from "./tools.js";
+
+// Event adapter (pi-agent protocol compatibility)
+export type {
+  AnthropicProviderOptions,
+  EventAdapterInput,
+  PiAgentEvent,
+  PiAgentMessage,
+  PiAssistantMessageEvent,
+  PiMessageContent,
+  PiToolResultMessage,
+} from "./event-adapter.js";
+export { collectPiAgentEvents, streamWithPiAgentEvents } from "./event-adapter.js";
+
+// Agent runner (main entry point)
+export type { AiSdkRunnerConfig, AiSdkRunResult } from "./run.js";
+export { isAiSdkEngineAvailable, mapThinkLevelToAnthropicOptions, runAiSdkAgent } from "./run.js";