{"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-mdpvafzk","versions":[{"created_at":"2026-06-10T13:17:40Z","element_count":85,"note":"backfill: 延床=居室床スラブ実面積92.5㎡(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":"02f39912cfb5b903e13f0f0745e722a954c04285e8435a358e7affc63c650f91","version":10},{"created_at":"2026-06-10T09:54:26Z","element_count":72,"note":"5軸GA polish 54->97 by M5 (autonomous)","saved_by":"mcp","sha256":"5c1c509f8e6c8a6118362512cabadd33834df3bb080c26d14bfbdbd6f80eed6f","version":2}]}