As tensions continue to escalate in the ongoing war involving Iran, a new development out of China is raising fresh concerns about how the conflict could evolve. A private Chinese aerospace company says it has begun mass-producing Mach 7 hypersonic missiles for as little as $99,000 each—a breakthrough that, if proliferated, could extend conflicts by making advanced weapons cheaper and more accessible. The development raises a more unsettling question: what happens when hypersonic weapons become cheap enough to mass-produce at scale? Beijing-based Lingkong Tianxing Technology released footage this week showing its YKJ-1000 missile in flight, including a confirmed strike at…