{"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-miym9yi4","versions":[{"created_at":"2026-06-10T13:16:17Z","element_count":66,"note":"backfill: 延床=居室床スラブ実面積93.9㎡(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":"273063b688d2e5931a8bd4b12ec50e9542815ac87e0d605b3b1014e759a5139a","version":10},{"created_at":"2026-06-10T09:37:43Z","element_count":71,"note":"5軸GA polish 61->97 by M5 (autonomous)","saved_by":"mcp","sha256":"0d66be1ae402c354b9955fdeb50f55d3c592c2709e082a94649251440e812d6a","version":2}]}