docs(compliance): add content compliance detection design spec
落地敏感词 / 广告法 / 行业违禁词检测的设计文档,覆盖 ops 强制 vs 自愿模式、 PolicyResolver fail-closed 语义、ack 防伪、LLM 事后复核队列等关键决策。 v1 版本保留备查并指向 superpowers spec。 Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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