{"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-1zj9qdvq","versions":[{"created_at":"2026-08-04T06:40:01Z","element_count":86,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"a1c6b41d9108b1857899d006dba4e71b2391d0bff78980f2cb9a89900dc60241","version":2},{"created_at":"2026-08-04T06:40:01Z","element_count":86,"note":"言葉から生成: LDK+主寝室+子供室2+浴室+収納","saved_by":"mcp:create","sha256":"","version":1}]}