Inside a worker `import fluksio` is the reporter, which had emit and the artifact calls but no logger — so `fluksio.logger.info(...)`, written against the SDK's top-level export, died with AttributeError after the training it was reporting on had already succeeded. Its records go to the same capture a print does; the handler resolves sys.stderr per record because a call runs under redirect_stderr. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_019Hra4ndWMCLU5F3KjUuVAc