{"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-8ovvby60","versions":[{"created_at":"2026-06-10T13:14:33Z","element_count":66,"note":"backfill: 延床=居室床スラブ実面積118.8㎡(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":"8c2f628355862c37cfc892d30aee57e1681c08f17e62812fc4d1e6da5717fc7b","version":10},{"created_at":"2026-06-10T09:21:29Z","element_count":73,"note":"5軸GA polish 61->97 by M5 (autonomous)","saved_by":"mcp","sha256":"cd9ff3bc379d7a4d84c5a93aba49012fea9377c7f54ba88f3e22d2d0f7ea1904","version":2}]}