[engine-failure] PROJ-543-predicting-molecular-interactions-in-pro @ tasks: RuntimeError

Automated report (spec 023 / FR-016) — an unexpected engine failure occurred while processing **PROJ-543-predicting-molecular-interactions-in-pro** at stage `tasks`.

```
RuntimeError: LLMReviewer[executability]: review frontmatter has neither `verdict:` nor `concerns:`/`action_items:` — a contentless/truncated review MUST NOT count as acceptance (false-convergence guard). First 200 chars: '```yaml\n---\nreviewer_name: rq_validity\nreviewer_kind: llm\nstage: tasks\nartifact_path: projects/PROJ-543-predicting-molecular-interactions-in-pro/specs/001-predicting-molecular-interactions-in-pro/task'
```

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 locating the LLMReviewer executability path that parses review frontmatter during the tasks stage, using the reported RuntimeError and project artifact path as search terms. Reproduce the truncated or contentless review case and inspect the relevant reviewer tests; done means it cannot count as acceptance while the project remains schedulable for retry.

Written by the indexing model from the issue text.