{"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-mayfairhouse-zoykgxj1","versions":[{"created_at":"2026-06-10T13:11:14Z","element_count":85,"note":"backfill: 延床=居室床スラブ実面積103.4㎡(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":"49d31939f6559776e517590610b85dd579b032a88d2d350993061212397719fd","version":11},{"created_at":"2026-06-10T08:15:19Z","element_count":89,"note":"5軸GA polish 43->98 by M5 (autonomous)","saved_by":"mcp","sha256":"5c30339257a28ac94f4a6775021e29091a23cc10a764e4abbc903cd84f46f0ed","version":2}]}