{"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-1rvcmo6x","versions":[{"created_at":"2026-06-10T13:13:27Z","element_count":85,"note":"backfill: 延床=居室床スラブ実面積103.4㎡(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":"4114685168fb3ad8f16bb26e402357ee86e9b332be8185215f85b8efab8572bd","version":10},{"created_at":"2026-06-10T09:05:16Z","element_count":74,"note":"5軸GA polish 60->97 by M5 (autonomous)","saved_by":"mcp","sha256":"22c923384366b8c462d665307de9cd1679f4649d99fdd857a3561e30198c4c73","version":2}]}