[engine-failure] PROJ-363-predicting-the-impact-of-additive-manufa @ tasks: RuntimeError

Automated report (spec 023 / FR-016) — an unexpected engine failure occurred while processing **PROJ-363-predicting-the-impact-of-additive-manufa** 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: tasked\nartifact_path: projects/PROJ-363-predicting-the-impact-of-additive-manufa/specs/001-predicting-the-impact-of-additive-manufa/tasks.'
```

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 ordering-stage frontmatter validation and reproduce the failure described for PROJ-363 at the tasks stage. Trace how a truncated review is handled; done means the false-convergence guard rejects contentless reviews without leaving the engine in an unrecoverable failure state, while preserving normal retry behavior.

Written by the indexing model from the issue text.