{"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-l4u3g2vj","versions":[{"created_at":"2026-06-10T13:14:48Z","element_count":85,"note":"backfill: 延床=居室床スラブ実面積81.7㎡(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":"69c855550dc4f95c45cb4db404c8fc5e9985359113267fd75e07329629c229e4","version":10},{"created_at":"2026-06-10T09:21:35Z","element_count":89,"note":"5軸GA polish 54->98 by M5 (autonomous)","saved_by":"mcp","sha256":"2c51ac3b8b5eff3699edbfd6a265ec8aa8aee650fe1ff8ed920db71d25905be0","version":2}]}