{"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-7iu8m07l","versions":[{"created_at":"2026-06-13T20:29:25Z","element_count":73,"note":"5軸GA polish 41->92 by M5 (autonomous)","saved_by":"mcp","sha256":"56ef7cd56448ed06197a2e94e760ca08c5c37f89a1680bc78380647bfa298a67","version":3},{"created_at":"2026-06-13T20:17:04Z","element_count":101,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"cd79b99181ec8d07174797e20158eb080ed9c283937ae9ad4f9746628359b7c4","version":2},{"created_at":"2026-06-13T20:17:02Z","element_count":101,"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}]}