{"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-r3dyxt6e","versions":[{"created_at":"2026-06-27T19:37:15Z","element_count":84,"note":"5軸GA polish 45->95 by M5 (autonomous)","saved_by":"mcp","sha256":"282f0cf49b9983862187ff91941ffa4bcfea369fd68c3d7d23c02090d905cca2","version":3},{"created_at":"2026-06-27T19:25:24Z","element_count":126,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"3ec5d781be99489c95c86b6103338c1e16b108156fc16106c90522120c9a8277","version":2},{"created_at":"2026-06-27T19:25:24Z","element_count":126,"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}]}