fix: retry server_is_overloaded errors (#25888)

packages/opencode/src/provider/error.ts

@@ -151,6 +151,7 @@ export function parseStreamError(input: unknown): ParsedStreamError | undefined
         isRetryable: false,
         responseBody,
       }
+    case "server_is_overloaded":
     case "server_error":
       return {
         type: "api_error",