{"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-a7jqha58","versions":[{"created_at":"2026-07-17T14:13:53Z","element_count":89,"note":"5軸GA polish 44->98 by M5 (autonomous)","saved_by":"mcp","sha256":"ec1682420212ee8067261c60fe5319290d30d66406ab39796735816f10df903d","version":3},{"created_at":"2026-07-17T13:59:53Z","element_count":105,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"89197c95a6eabb57ce8ae210f4ad8de993b5cb131ed3c0e9be2278a456ba56f9","version":2},{"created_at":"2026-07-17T13:59:53Z","element_count":105,"note":"言葉から生成: LDK+主寝室+子供室+浴室+収納","saved_by":"mcp:create","sha256":"","version":1}]}