{"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-usfvpmw8","versions":[{"created_at":"2026-06-10T13:13:28Z","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":"2026-06-10T09:05:41Z","element_count":84,"note":"5軸GA polish 52->98 by M5 (autonomous)","saved_by":"mcp","sha256":"ed34c09a8c583a744fdef27eea778a1f40909389b73967dccb21b3db6c7fb028","version":2}]}