{"note":"bim_versions 導入後の保存のみ記録 (それ以前は bim_canonical 上書きで履歴なし)","ok":true,"slug":"u-arkleyedgehouse-3av2myaz","versions":[{"created_at":"2026-07-24T11:47:59Z","element_count":126,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"988e60be859e33de34e5a96cf60923dcb0a511274ec3e8b13b825255b0168d39","version":2},{"created_at":"2026-07-24T11:47:53Z","element_count":126,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}