Make explicit that ALL formatting/HTML is owned by recipe-report.py render() and
the model's only artifact is the spec JSON — never hand-write/edit HTML. Matters
now that glm-5.2 drives the report. Also fix stale 'default opus' refs (report
now defaults to opencode-go/glm-5.2, overridable via REPORT_BACKEND/REPORT_MODEL).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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