{"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-uf8wh7fb","versions":[{"created_at":"2026-06-13T21:01:38Z","element_count":73,"note":"5軸GA polish 44->97 by M5 (autonomous)","saved_by":"mcp","sha256":"be9cce0ba7343a894ffdde1cc30f0d7bb7a3376b78ea2c92bab90e21644fc099","version":3},{"created_at":"2026-06-13T20:44:36Z","element_count":90,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"064e7566a21c1659a85601c233724b43a48a710d962e8c5ebc51068dbba372ae","version":2},{"created_at":"2026-06-13T20:44:34Z","element_count":90,"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}]}