{"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-cogu38yz","versions":[{"created_at":"2026-06-13T16:42:48Z","element_count":84,"note":"5軸GA polish 43->96 by M5 (autonomous)","saved_by":"mcp","sha256":"13dac4876e3987ee54189ebde6051dd362bf495bc87ad64bb7ce5afd5c71f135","version":3},{"created_at":"2026-06-13T16:28:42Z","element_count":88,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"cdf2225a1561d06e70367efcce22368ed5d4b766b8802219d299faf5e490f0e4","version":2},{"created_at":"2026-06-13T16:28:36Z","element_count":88,"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}]}