{"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-ao45d8bw","versions":[{"created_at":"2026-06-10T13:12:57Z","element_count":77,"note":"backfill: 延床=居室床スラブ実面積77.0㎡(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":"d0e7500d0db456f72797132275e86e2fbaba136fc20c40270faa7b42474b19e4","version":11},{"created_at":"2026-06-10T08:48:57Z","element_count":74,"note":"5軸GA polish 60->97 by M5 (autonomous)","saved_by":"mcp","sha256":"22c923384366b8c462d665307de9cd1679f4649d99fdd857a3561e30198c4c73","version":3}]}