人間が書いた設計文書はどれ？
著者は同じオープンソースWebアプリの設計文書を3種類作成：人間が16時間かけて手書きしたもの、Claude Opus 4.6で生成したもの、GPT-5.4で生成したもの。AI版は数分で作成され、AIエージェントは著者の手書き版を見ずに生成した。
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