A new technology-driven real estate firm is launching in Denver this month with plans to crack the traditional real estate brokerage industry’s thick walls in a way no other startup has ever managed. REX Real Estate Exchange, based in Woodland Hills, Calif., will roll out the large siege engines of artificial intelligence, big-data analytics, targeted social media marketing and even robots in its push to lower commissions on home sales to 2 percent from the current rate of 5 to 6 percent. REX plans to break through the brokerage industry’s defenses by recruiting the people most likely to sell or buy a home before they ever reach an agent.