{"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-4djnu3nj","versions":[{"created_at":"2026-08-04T06:05:12Z","element_count":105,"note":"loop3: 設計時延床 42.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"8fefe83d2744e17f8b964e03c9a79ddaab714d944b484d00886019dbfb816856","version":2},{"created_at":"2026-08-04T06:05:12Z","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}]}