{"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-bh33ghxe","versions":[{"created_at":"2026-06-29T19:38:18Z","element_count":90,"note":"5軸GA polish 42->95 by M5 (autonomous)","saved_by":"mcp","sha256":"b9b1f81316650fa1c82199b6c7b8ef43a990e4d58d4540960884fdd4264030d6","version":3},{"created_at":"2026-06-29T19:23:37Z","element_count":101,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"4e8af4cf37b86c5c05b26706ebbca153bef29811f6f6818f4b41de101c61ef3c","version":2},{"created_at":"2026-06-29T19:23:37Z","element_count":101,"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}]}