[engine-failure] PROJ-064-statistical-discrepancies-in-publicly-av @ spec: RuntimeError

Automated report (spec 023 / FR-016) — an unexpected engine failure occurred while processing **PROJ-064-statistical-discrepancies-in-publicly-av** at stage `spec`.

```
RuntimeError: LLMReviewer[requirements_coverage]: `concerns:`/`action_items:` must be a list; got str
```

The project remains schedulable; it will retry on its normal cadence and recover once the underlying defect is fixed. Closing this issue does not require any project-state change.

Start by searching for LLMReviewer and the requirements_coverage stage, then trace how the automated report handles concerns and action_items. Reproduce spec 023 / FR-016 if possible and verify that the engine no longer raises the list-versus-string RuntimeError and can retry normally.

Written by the indexing model from the issue text.