Anthropic and the local provider do not send a JSON mode, so a compliant model
still wraps its { "summary": … } reply in a code fence or prefixes a sentence,
which broke JSON.parse and surfaced the raw fenced string as the assessment.
Add a shared stripJsonFences helper (drop the fence, narrow to the first { …
last }) and apply it as a parse fallback in parseSummaryFromContent. No-op on
already-clean JSON.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>