model_test — debug/signals.mat contains only input signals, no output signals — assessments fail

### Bug Report

[BUG-001-model-test-debug-signals-no-output.md](https://github.com/user-attachments/files/27580827/BUG-001-model-test-debug-signals-no-output.md)

### Additional Context

_No response_