{"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-zd3tnbhl","versions":[{"created_at":"2026-08-04T19:44:53Z","element_count":85,"note":"loop3: 設計時延床 70.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"05350dde8c9254756582bc6608265232c579b6799f54f56df0f52ab2447691b6","version":2},{"created_at":"2026-08-04T19:44:53Z","element_count":85,"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}]}