{"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-y1xjd0si","versions":[{"created_at":"2026-06-10T13:24:28Z","element_count":66,"note":"backfill: 延床=居室床スラブ実面積106.2㎡(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":"a6b821aa8d047d74511f8e15c5300e0efdc0886edb22cd9e2661f05a4c6a0c36","version":10},{"created_at":"2026-06-10T10:53:13Z","element_count":72,"note":"5軸GA polish 60->96 by M5 (autonomous)","saved_by":"mcp","sha256":"7e72c35d54886e243120481d8f232cd9b11dcbfe19abaf9ae4e96db8ba4b037c","version":3}]}