{"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-qhafdkyt","versions":[{"created_at":"2026-08-14T14:42:18Z","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":"2c26a67b769692775f034845b003366f75c9a5470f963ee4df10181c87a3e7a8","version":2},{"created_at":"2026-08-14T14:42:18Z","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}]}