[engine-failure] PROJ-404-predicting-molecular-surface-charge-dist @ plan: RuntimeError

Automated report (spec 023 / FR-016) — an unexpected engine failure occurred while processing **PROJ-404-predicting-molecular-surface-charge-dist** at stage `plan`.

```
RuntimeError: LLMReviewer[plan_consistency]: 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: plan_consistency\nreviewer_kind: llm\nstage: planned\nartifact_path: projects/PROJ-404-predicting-molecular-surface-charge-dist/specs/001-predicting-molecular-surface-charge-di'
```

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 plan-stage LLMReviewer[plan_consistency] handling for projects/PROJ-404-predicting-molecular-surface-charge-dist/specs/001-predicting-molecular-surface-charge-di... and inspect how review frontmatter is parsed. Reproduce the truncated or contentless review case and verify that it cannot count as acceptance while normal retries remain schedulable.

Written by the indexing model from the issue text.