{"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-2oqfn7yx","versions":[{"created_at":"2026-06-10T13:25:33Z","element_count":63,"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":"cc38685c5225839bd7447112305e831af6ba576ab1865d3ce6dd993b7022f9ee","version":11},{"created_at":"2026-06-10T11:10:01Z","element_count":84,"note":"5軸GA polish 54->97 by M5 (autonomous)","saved_by":"mcp","sha256":"550f76341095cae82d2aca5572b1d3f83004e099840383504c6f481ea8bab6cb","version":4}]}