[engine-failure] PROJ-007-energy-systems @ tasks: RuntimeError

Automated report (spec 023 / FR-016) — an unexpected engine failure occurred while processing **PROJ-007-energy-systems** at stage `tasks`.

```
RuntimeError: LLMReviewer[coverage]: 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: coverage\nreviewer_kind: llm\nstage: tasked\nartifact_path: projects/PROJ-007-energy-systems/tasks.md\nartifact_hash: 79999999999999999999999999999999'
```

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 coverage handling that parses review frontmatter for PROJ-007-energy-systems/tasks.md, using the reported truncated YAML as the reproduction shape. Done means a review with neither verdict nor concerns/action_items is rejected as non-acceptance, while the project remains schedulable and can retry normally.

Written by the indexing model from the issue text.