fix(coding-agent): retry explicit provider retry errors

closes #6019

packages/ai/src/index.ts

@@ -43,5 +43,6 @@ export type {
 	OAuthSelectPrompt,
 } from "./utils/oauth/types.ts";
 export * from "./utils/overflow.ts";
+export * from "./utils/retry.ts";
 export * from "./utils/typebox-helpers.ts";
 export * from "./utils/validation.ts";