{"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-ln3x2xuf","versions":[{"created_at":"2026-06-19T06:16:59Z","element_count":90,"note":"5軸GA polish 44->98 by M5 (autonomous)","saved_by":"mcp","sha256":"da46ccb89be5847c23098019c4b86b7a9a85048920e5f0ed51b8928b5e8aa7af","version":3},{"created_at":"2026-06-19T05:57:44Z","element_count":130,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"0132c546f5f4a440e2c89e285eb5a6ae79a77860990423e6c77b2392d54502f5","version":2},{"created_at":"2026-06-19T05:57:41Z","element_count":130,"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}]}