{"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-v38893v1","versions":[{"created_at":"2026-07-17T14:13:53Z","element_count":84,"note":"5軸GA polish 43->96 by M5 (autonomous)","saved_by":"mcp","sha256":"13dac4876e3987ee54189ebde6051dd362bf495bc87ad64bb7ce5afd5c71f135","version":3},{"created_at":"2026-07-17T14:01:00Z","element_count":126,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"66cccbe0981d21aca9b9b987d441beece6d8ad396df734caf7b937dee7add299","version":2},{"created_at":"2026-07-17T14:01:00Z","element_count":126,"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}]}