Fix child pane reopening and overload retries

crates/galaxy_agent_rig/src/stream_tests.rs

@@ -14,3 +14,16 @@ fn flattened_sse_http_client_error_is_recoverable_transport() {
     assert_eq!(mapped.kind, AgentErrorKind::Transport);
     assert!(mapped.recoverable);
 }
+
+#[test]
+fn flattened_streamed_provider_overload_is_recoverable() {
+    let error = CompletionError::ProviderError(
+        r#"{"type":"error","error":{"type":"service_unavailable_error","code":"server_is_overloaded","message":"Our servers are currently overloaded. Please try again later."}}"#
+            .to_string(),
+    );
+
+    let mapped = map_completion_error(error);
+
+    assert_eq!(mapped.kind, AgentErrorKind::Provider);
+    assert!(mapped.recoverable);
+}