China's economy is mending itself unevenly, and the markets are making a wager on which version of the country emerges. While the sectors that employ the most people — consumption and property — remain stalled, artificial intelligence and semiconductor companies are attracting the capital and confidence that once flowed toward mass growth. The Star Market 50's 9 percent August rebound, following a bruising 26 percent July decline, is less a sign of broad recovery than a portrait of an economy splitting along a fault line between the old engines of growth and the new ones.