{"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-house-w36vrad6","versions":[{"created_at":"2026-07-17T14:13:53Z","element_count":90,"note":"5軸GA polish 45->96 by M5 (autonomous)","saved_by":"mcp","sha256":"584855c9a88478e0a1a53aef600e7b977327370614e1150956c713a63b3b5e17","version":3},{"created_at":"2026-07-17T14:05:46Z","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":"f0aeb73a3768484b0b4d2c10fc8c00873539644692a1b27aea509c3ff609b550","version":2},{"created_at":"2026-07-17T14:05:45Z","element_count":126,"note":"言葉から生成: LDK+主寝室+子供室2+浴室+収納","saved_by":"mcp:create","sha256":"","version":1}]}