{"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-jv8dnh84","versions":[{"created_at":"2026-06-10T13:16:07Z","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":"909c7eed876ec03315d227d56852c51f04918a79ab6c7036a45823841bb6d561","version":10},{"created_at":"2026-06-10T09:37:55Z","element_count":91,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"c9e034cc102a25dedc9c01eac61e848237247cd9c4f315bf2962484cc965e031","version":2}]}