{"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-4su79p1d","versions":[{"created_at":"2026-06-10T13:19:17Z","element_count":65,"note":"backfill: 延床=居室床スラブ実面積93.5㎡(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":"6347d1fa64dc627d47023bf28f95344778cb78525ecedb8751380703cee74b29","version":10},{"created_at":"2026-06-10T10:09:04Z","element_count":85,"note":"5軸GA polish 61->98 by M5 (autonomous)","saved_by":"mcp","sha256":"1aab18c68a968c2905a22b0eba8dffaf78c9b6817be44f7b635295a8d76461c0","version":2}]}