{"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-langtonwaybungalow-yj2bwvk7","versions":[{"created_at":"2026-06-10T13:11:31Z","element_count":65,"note":"backfill: 延床=居室床スラブ実面積90.0㎡(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":"d67e582eba0cc7da9a3902a4800e6a8e3f8a363dd469ff3c27ff0959a2706025","version":11},{"created_at":"2026-06-10T08:22:36Z","element_count":84,"note":"5軸GA polish 43->98 by M5 (autonomous)","saved_by":"mcp","sha256":"7028bc79801898dc0604046aba5237742046f060fe11d888cfd2ac1e7afbd14b","version":2}]}