[engine-failure] PROJ-1060-llmxive-follow-up-extending-abot-agentos @ tasks: RuntimeError

Automated report (spec 023 / FR-016) — an unexpected engine failure occurred while processing **PROJ-1060-llmxive-follow-up-extending-abot-agentos** at stage `tasks`.

```
RuntimeError: LLMReviewer[coverage]: 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: coverage\nreviewer_kind: llm\nstage: tasked\nartifact_path: projects/PROJ-1060-llmxive-follow-up-extending-abot-agentos/specs/001-llmxive-follow-up-extending-abot-agentos/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 reported review artifact under `projects/PROJ-1060-llmxive-follow-up-extending-abot-agentos/specs/001-llmxive-follow-up-extending-abot-agentos/tasks` and tracing how `LLMReviewer[coverage]` validates its frontmatter. The report identifies missing `verdict`, `concerns`, and `action_items` fields but does not name the underlying defect or a test. Done means the cause is addressed without allowing a contentless or truncated review to count as acceptance.

Written by the indexing model from the issue text.