[engine-failure] PROJ-126-predicting-avian-migration-patterns-from @ tasks: RuntimeError

Automated report (spec 023 / FR-016) — an unexpected engine failure occurred while processing **PROJ-126-predicting-avian-migration-patterns-from** at stage `tasks`.

```
RuntimeError: LLMReviewer[ordering]: 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: ordering\nreviewer_kind: llm\nstage: tasks\nartifact_path: projects/PROJ-126-predicting-avian-migration-patterns-from/specs/001-predicting-avian-migration-patterns-from/tasks.m'
```

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 LLMReviewer[ordering] handling of the review frontmatter for projects/PROJ-126-predicting-avian-migration-patterns-from/specs/001-predicting-avian-migration-patterns-from/tasks.md, using the reported RuntimeError as reproduction context. Verify that a review containing neither verdict nor concerns/action_items cannot be accepted, and confirm the retry remains schedulable without project-state changes.

Written by the indexing model from the issue text.