{"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-7c3mm5q7","versions":[{"created_at":"2026-06-10T13:15:43Z","element_count":77,"note":"backfill: 延床=居室床スラブ実面積97.8㎡(基礎/屋外/ロフト除外)。設備数量/コスト過大の是正","saved_by":"mcp","sha256":"23247ee7df3269cd38fde9a922802476da9ec64f771184abecd2d5c9a93d9625","version":10},{"created_at":"2026-06-10T09:37:56Z","element_count":90,"note":"5軸GA polish 58->98 by M5 (autonomous)","saved_by":"mcp","sha256":"e0ac263a700e52ee7977f28237097522544d48c5def34f11875aa9da3ff7ba85","version":2}]}