{"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-ljmr380j","versions":[{"created_at":"2026-06-10T13:12:33Z","element_count":63,"note":"backfill: 延床=居室床スラブ実面積93.5㎡(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":"a044cb624f556f8041e07a4b0524456a8bee64b3c07fb2da80200ea0b0bd23be","version":11},{"created_at":"2026-06-10T08:48:53Z","element_count":84,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"a533c00f44b56b6d9f9fde09cbb5f7f4be0d82ecb898ca45ecb895bd00a6fbce","version":3}]}