export error classes (#624)

* export error classes

* changeset

Author: seanmcguire12

.changeset/plenty-pandas-fly.md

@@ -0,0 +1,5 @@
+---
+"@browserbasehq/stagehand": patch
+---
+
+export stagehand error classes so they can be referenced from @dist

lib/index.ts

@@ -918,3 +918,5 @@ export * from "../types/stagehand";
 export * from "../types/operator";
 export * from "../types/agent";
 export * from "./llm/LLMClient";
+export * from "../types/stagehandErrors";
+export * from "../types/stagehandApiErrors";