{"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-ss7n7rhk","versions":[{"created_at":"2026-06-10T13:10:57Z","element_count":77,"note":"backfill: 延床=居室床スラブ実面積87.5㎡(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":"98a194aeaf498b958603c17fa0719e363361d8ed11502fa338bd946d1765e24c","version":11},{"created_at":"2026-06-10T08:15:43Z","element_count":89,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"2375e211d912d6f2eb192a5f47260cce3fbf4a5dc4892b7f6056bb70f3d8e4d8","version":2}]}