{"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-exf4g7xh","versions":[{"created_at":"2026-06-10T13:24:33Z","element_count":85,"note":"backfill: 延床=居室床スラブ実面積78.3㎡(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":"847b1331e0453538f253e340c3db057855f5639102cf0e5794bf300206909037","version":10},{"created_at":"2026-06-10T10:53:18Z","element_count":73,"note":"5軸GA polish 60->97 by M5 (autonomous)","saved_by":"mcp","sha256":"5215e3bf79a088c04a71c8ca2cb8f0581ab24f51693ffa543fd93bbb217a0fba","version":3}]}