{"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-ztmxonch","versions":[{"created_at":"2026-06-10T13:24:32Z","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":"2026-06-10T10:53:01Z","element_count":84,"note":"5軸GA polish 61->98 by M5 (autonomous)","saved_by":"mcp","sha256":"5bd3747f7436cf613b9af104535355e85d5c149a1e4aaee2994423abc30b3627","version":3}]}