{"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-a1q3usl9","versions":[{"created_at":"2026-07-24T19:30:17Z","element_count":85,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"812c72bf6f0b841adba8642944241b81d7175d0abcc5cfbd5ee88f0209530926","version":2},{"created_at":"2026-07-24T19:30:16Z","element_count":85,"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}]}