fix(ralph-loop): reject promptAsync error responses

src/shared/index.ts

@@ -68,6 +68,7 @@ export * from "./opencode-message-dir"
 export * from "./opencode-command-dirs"
 export * from "./project-discovery-dirs"
 export * from "./normalize-sdk-response"
+export * from "./record-type-guard"
 export * from "./session-directory-resolver"
 export * from "./prompt-tools"
 export * from "./compaction-marker"