By Malathi Nayak SAN FRANCISCO (Reuters) – Virtual-reality technology startup Oculus VR denied allegations by videogame publisher ZeniMax Media Inc that it stole trade secrets during development of a gaming headset in a response filed in a federal court on Wednesday. Last month, ZeniMax Media filed a lawsuit against Oculus in a federal court in Texas, alleging theft of trade secrets during development of a gaming headset by the virtual-reality startup that Facebook Inc has agreed to buy for $2 billion. …