{"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-willowbrookbungalow-kmm8hegt","versions":[{"created_at":"2026-06-25T07:21:04Z","element_count":90,"note":"5軸GA polish 38->91 by M5 (autonomous)","saved_by":"mcp","sha256":"a54d6b057ae681e63d301822d2defccb272bb21554d8df602b321553c104fcf1","version":3},{"created_at":"2026-06-25T07:16:45Z","element_count":101,"note":"loop3: 設計時延床 45.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"7b4db6218d4d932375ff1fcff0878dbf211666297f383ca1ae074837923768c4","version":2},{"created_at":"2026-06-25T07:16:45Z","element_count":101,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}