Single Gemini call per asset. Prompt assembles attached Source
Messaging summaries + media-plan language context + the asset image.
Returns structured JSON with score, summary, and a findings array
(priority, category, quote, issue, suggested fix, source reference).
Empty findings = clean asset; missing reference -> score 0 with a
clear message rather than running blind.
Mirrors the boots_tandc_wording pattern: subclass FlaskAppTemplate,
expose a static prompt template, let process_single_check inject
reference-asset content and media-plan context at runtime. A
standalone build_prompt() helper mirrors that assembly for unit-
style smoke tests and ad-hoc prompt inspection.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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