{"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-rn0gsd04","versions":[{"created_at":"2026-06-19T06:17:07Z","element_count":85,"note":"5軸GA polish 44->98 by M5 (autonomous)","saved_by":"mcp","sha256":"d7ebc6c28556930d11ef5b7cc0b6699f7e4371c833b6fc0c67230f882774c54f","version":3},{"created_at":"2026-06-19T06:03:34Z","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":"453f1e7801ef3183807057a75d2368b2b02f41f2b02b9692967b4c666219f426","version":2},{"created_at":"2026-06-19T06:03:33Z","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}]}