The danger lurking in China’s debt-laden real estate sector was never so clear as in late September, when word of a possible cash crunch at China Evergrande Group, the world’s most indebted property developer, sent investors running for the exits. With seven more of the 10 most-indebted developers also based in China, policymakers in Beijing have drafted what state-run media are calling “three red lines” — metrics regarding debt that developers will have to meet if they want to borrow more. The