[engine-failure] PROJ-082-investigating-the-correlation-between-st @ tasks: RuntimeError

Automated report (spec 023 / FR-016) — an unexpected engine failure occurred while processing **PROJ-082-investigating-the-correlation-between-st** 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: fleshed_out_complete\nartifact_path: projects/PROJ-082-investigating-the-correlation-between-st/specs/001-investigating-the-correlation-'
```

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 check that parses review frontmatter, then reproduce the failure described for PROJ-082 at the tasks stage. Verify that a review lacking verdict, concerns, and action_items is rejected rather than counted as acceptance, and run the relevant reviewer or engine tests if available.

Written by the indexing model from the issue text.