[engine-failure] PROJ-071-exploring-the-correlation-between-molecu @ tasks: RuntimeError

Automated report (spec 023 / FR-016) — an unexpected engine failure occurred while processing **PROJ-071-exploring-the-correlation-between-molecu** 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-071-exploring-the-correlation-between-molecu/specs/001-exploring-the-correlation-between-molecu/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 with spec 023 / FR-016 and the tasks-stage handling for the artifact under projects/PROJ-071-exploring-the-correlation-between-molecu/specs/001-exploring-the-correlation-between-molecu. Trace LLMReviewer[executability] processing of review frontmatter, then verify that a review lacking verdict, concerns, and action_items is rejected rather than counted as acceptance and that normal retry recovery remains possible.

Written by the indexing model from the issue text.