{"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-zse78428","versions":[{"created_at":"2026-06-10T13:34:21Z","element_count":65,"note":"backfill: 延床=居室床スラブ実面積93.9㎡(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":"46b7f3ae42cf07609c9c43f37eb8ca926cd81f87d583a53be1acfe1b5ab56ba3","version":7},{"created_at":"2026-06-10T12:31:47Z","element_count":72,"note":"5軸GA polish 57->96 by M5 (autonomous)","saved_by":"mcp","sha256":"50da0e57a2afcd8e1baab40e2e13e6a44f4dbdf7f0623d6e88c2792a2de388b2","version":3}]}