{"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-ssq8xjao","versions":[{"created_at":"2026-06-11T01:22:04Z","element_count":90,"note":"5軸GA polish 43->97 by M5 (autonomous)","saved_by":"mcp","sha256":"800cc7727b5d79d99f16e0bc70566f442d47bbcbad46528edefcac1d484e4978","version":13},{"created_at":"2026-06-10T22:40:48Z","element_count":46,"note":"loop3: 設計時延床 53.4㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"b208997d8bec6bd9557dc75937ba056d17751798c4169f76eb0c225bb3fa0ad1","version":2}]}