feat(agent-sdk): add public surface re-exports

sdks/typescript-agent-sdk/src/index.ts

@@ -0,0 +1,35 @@
+/**
+ * @litellm/agent-sdk — public surface.
+ *
+ * Three-level hierarchy:
+ *   Agent       — definition (model, system prompt, tools)
+ *     ↓
+ *   Session     — VM sandbox running under an agent
+ *     ↓
+ *   Run         — single execution within a session
+ */
+
+export { Agent, AgentHandle } from "./agent.js";
+export { SessionHandle } from "./session.js";
+export { Run } from "./run.js";
+
+export type {
+  AgentCreateOptions,
+  AgentInfo,
+  ClientOptions,
+  ConversationTurn,
+  CreateSessionOptions,
+  ListOptions,
+  ListResult,
+  Message,
+  ModelRef,
+  RunEvent,
+  RunInfo,
+  RunResult,
+  RunStatus,
+  SDKImage,
+  SessionInfo,
+  SessionStatus,
+} from "./types.js";
+
+export { LiteLLMAgentError } from "./types.js";