{"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-sx9g6kl7","versions":[{"created_at":"2026-06-11T04:11:14Z","element_count":83,"note":"5軸GA polish 44->98 by M5 (autonomous)","saved_by":"mcp","sha256":"a1610d5b4be2bb4d128ea7fa08a5c3560f1a4c40d048d413e8984d63ad36e5a3","version":3},{"created_at":"2026-06-11T04:06:37Z","element_count":105,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"4d8d493a7e54d11385604f5f7eb8ea7bad22f4423220750946ab9097e33a89dc","version":2}]}