[engine-failure] PROJ-510-predicting-the-glass-forming-region-of-a @ tasks: RuntimeError

Automated report (spec 023 / FR-016) — an unexpected engine failure occurred while processing **PROJ-510-predicting-the-glass-forming-region-of-a** 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-510-predicting-the-glass-forming-region-of-a/specs/001-predicting-the-glass-forming-region-of-a/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 inspecting the review artifact under `projects/PROJ-510-predicting-the-glass-forming-region-of-a/specs/001-predicting-the-glass-forming-region-of-a/tasks.` and the ordering reviewer validation mentioned in the error. Trace how review frontmatter is checked for `verdict:` or `concerns:`/`action_items:`. Done means a contentless or truncated review does not count as acceptance and the engine no longer fails on this case.

Written by the indexing model from the issue text.