{"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-8jvifrf6","versions":[{"created_at":"2026-06-11T04:11:16Z","element_count":82,"note":"5軸GA polish 39->93 by M5 (autonomous)","saved_by":"mcp","sha256":"82ddfa3613eaf6e6ed5fa28954d1b80ac688f5421c1f07e0ddd02465aef8650e","version":3},{"created_at":"2026-06-11T03:56:29Z","element_count":119,"note":"loop3: 設計時延床 52.1㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"aef095bff7937b05be965606b7128264fdc9594b30b1d1ec65eb961b08862e21","version":2}]}