revise July 2025 product metrics articles

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+<svg xmlns="http://www.w3.org/2000/svg" width="960" height="580" viewBox="0 0 960 580" role="img" aria-labelledby="title desc"><title id="title">Матрица metric и guardrail</title><desc id="desc">Таблица отделяет допустимый сигнал от трёх условий, которые ведут к остановке решения.</desc><rect width="960" height="580" fill="#101827"/><text x="55" y="65" fill="#f8fafc" font-family="Arial" font-size="30" font-weight="700">Metric без contract не допускает решение</text><g font-family="Arial" font-size="19"><rect x="55" y="105" width="850" height="58" fill="#334155"/><text x="85" y="142" fill="white">Проверка</text><text x="410" y="142" fill="white">Сигнал</text><text x="695" y="142" fill="white">Результат</text><g fill="#e2e8f0"><rect x="55" y="163" width="850" height="72" fill="#172554"/><text x="85" y="207">attribution</text><text x="410" y="207">subject + requestId</text><text x="695" y="207">иначе HOLD</text><rect x="55" y="235" width="850" height="72" fill="#0f172a"/><text x="85" y="279">denominator</text><text x="410" y="279">unique opened subject</text><text x="695" y="279">иначе HOLD</text><rect x="55" y="307" width="850" height="72" fill="#172554"/><text x="85" y="351">cohort и period</text><text x="410" y="351">одно окно для вариантов</text><text x="695" y="351">иначе HOLD</text><rect x="55" y="379" width="850" height="72" fill="#0f172a"/><text x="85" y="423">guardrail</text><text x="410" y="423">render_failed / opened</text><text x="695" y="423">human review</text></g></g><rect x="55" y="488" width="850" height="46" rx="12" fill="#7f1d1d"/><text x="480" y="519" fill="#fee2e2" font-family="Arial" font-size="19" text-anchor="middle">Local movement — не ship; сначала проверка измерительного контракта.</text></svg>