{"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-el7rmmx8","versions":[{"created_at":"2026-06-10T13:15:17Z","element_count":85,"note":"backfill: 延床=居室床スラブ実面積78.3㎡(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":"86e0c22dab5d3f123b683f21a1fe085a4f1558711b30dd74fc06adea7fbb4809","version":10},{"created_at":"2026-06-10T09:21:43Z","element_count":73,"note":"5軸GA polish 60->97 by M5 (autonomous)","saved_by":"mcp","sha256":"5c36a17c273a3c860fc253b75e668e94f06b158c02cbd5e23b8e0d15c8fed4dd","version":2}]}