{"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-if77qzsg","versions":[{"created_at":"2026-06-10T13:10:12Z","element_count":66,"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":"96d1fa0f38d73d694930058455af3e319b9b5fbee6d41e18ee60caaba5544fbc","version":11},{"created_at":"2026-06-10T07:59:22Z","element_count":90,"note":"5軸GA polish 61->98 by M5 (autonomous)","saved_by":"mcp","sha256":"08aaf7b1a11ea3df7389c7348950e3aec093f33c98720af11d8171a8b272741f","version":2}]}