[engine-failure] PROJ-286-the-influence-of-perceived-agency-in-ai- @ tasks: RuntimeError

Automated report (spec 023 / FR-016) — an unexpected engine failure occurred while processing **PROJ-286-the-influence-of-perceived-agency-in-ai-** at stage `tasks`.

```
RuntimeError: LLMReviewer[executability]: 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: tasks\nartifact_path: projects/PROJ-286-the-influence-of-perceived-agency-in-ai-/specs/001-the-influence-of-perceived-agency-in-ai/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 tracing the tasks-stage LLMReviewer validation associated with projects/PROJ-286-the-influence-of-perceived-agency-in-ai-/specs/001-the-influence-of-perceived-agency-in-ai/tasks and reproduce the reported RuntimeError. Determine why a review with neither verdict nor concerns/action_items reaches acceptance handling. Done means contentless or truncated reviews are rejected without false convergence and the normal retry can recover.

Written by the indexing model from the issue text.