A native session's messages went to ONNX Runtime's stdio logger, which is nowhere once the app is launched from a menu — and what a provider says while partitioning a graph (nodes taken, operators declined, a library that failed to load) is most of what a failed rung tells you. Each session now forwards them to `log` under the target `onnxruntime`: warnings always, the runtime's info lines at `debug`, its verbose lines at `trace`.