[engine-failure] PROJ-134-the-cognitive-mechanisms-underlying-intu @ tasks: RuntimeError

Automated report (spec 023 / FR-016) — an unexpected engine failure occurred while processing **PROJ-134-the-cognitive-mechanisms-underlying-intu** at stage `tasks`.

```
RuntimeError: LLMReviewer[constraint_preservation]: 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: constraint_preservation\nreviewer_kind: llm\nstage: tasks\nartifact_path: projects/PROJ-134-the-cognitive-mechanisms-underlying-intu/specs/001-the-cognitive-mechanisms-underlyi'
```

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 tracing the LLMReviewer constraint_preservation handling at the tasks stage and inspect the review frontmatter described in spec 023 / FR-016. Reproduce the failure with PROJ-134-the-cognitive-mechanisms-underlying-intu and verify that a truncated or contentless review is not accepted and the project recovers on retry.

Written by the indexing model from the issue text.