{"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-a81gg8qy","versions":[{"created_at":"2026-06-10T13:44:25Z","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":"27d5c39f29d8a21c254858222794a6bfde74b5537f842d04d6d555940fe60695","version":7},{"created_at":"2026-06-10T13:22:21Z","element_count":84,"note":"5軸GA polish 58->98 by M5 (autonomous)","saved_by":"mcp","sha256":"2a2539a74dc81a088a2b8831756c659b5c953f1ba79e973e352307f234184f5d","version":4}]}