[engine-failure] PROJ-078-predicting-polymer-degradation-pathways- @ plan: RuntimeError

Automated report (spec 023 / FR-016) — an unexpected engine failure occurred while processing **PROJ-078-predicting-polymer-degradation-pathways-** at stage `plan`.

```
RuntimeError: LLMReviewer[methodology]: 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: rq_validity\nreviewer_kind: llm\nstage: planned\nartifact_path: projects/PROJ-078-predicting-polymer-degradation-pathways-/specs/001-predicting-polymer-degradation-pathways/pla'
```

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 engine handling for the LLMReviewer methodology review, then inspect the referenced artifact under projects/PROJ-078-predicting-polymer-degradation-pathways-/specs/001-predicting-polymer-degradation-pathways/. Reproduce the retry or review-processing failure and verify that a truncated or contentless review cannot count as acceptance and that the project remains schedulable.

Written by the indexing model from the issue text.