[engine-failure] PROJ-558-consciousness-bootstrapping-self-aware-a @ tasks: RuntimeError

Automated report (spec 023 / FR-016) — an unexpected engine failure occurred while processing **PROJ-558-consciousness-bootstrapping-self-aware-a** 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-558-consciousness-bootstrapping-self-aware-a/specs/001-consciousness-bootstrapping-self-aware-a/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 tracing the LLMReviewer executability check for the tasks stage and how it parses the review frontmatter shown in the error. Reproduce the failure against the referenced consciousness-bootstrapping project artifact, then confirm that a contentless or truncated review cannot count as acceptance while valid verdict or concerns/action_items frontmatter still works.

Written by the indexing model from the issue text.