{"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-cpb3c5ju","versions":[{"created_at":"2026-06-10T13:14:43Z","element_count":62,"note":"backfill: 延床=居室床スラブ実面積118.8㎡(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":"fbda65200ddb5d3f85c224a069a1bfd84af71249fa3eb75313fc275b29670156","version":10},{"created_at":"2026-06-10T09:21:37Z","element_count":89,"note":"5軸GA polish 52->98 by M5 (autonomous)","saved_by":"mcp","sha256":"9ba0d079b205a3de722bc1a61c9deb23e3014565b91c92d1751f43c71e5103bf","version":2}]}