{"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-1uqot0d0","versions":[{"created_at":"2026-06-10T13:23:33Z","element_count":85,"note":"backfill: 延床=居室床スラブ実面積103.4㎡(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":"74b1c66b49525b35311ff9474e847654d59716a33ce0a88538f870a54e8cb5d2","version":10},{"created_at":"2026-06-10T10:37:35Z","element_count":83,"note":"5軸GA polish 61->98 by M5 (autonomous)","saved_by":"mcp","sha256":"bf3f1182fdb4d4f97eb12005840628f3d9495d202a7d99ba1a642e75e2dd65f3","version":2}]}