You might not know yet of XYZ Venture Capital, a four-year-old, San Francisco-based seed-stage venture firm, but many veterans of Palantir are surely aware of it. XYZ says it has already backed 22 startups whose founders came out of the data analysis company, including most notably, Anduril, Lucky Palmer’s defense tech startup. In fact, the founder of XYZ, Ross Fubini, says his firm wrote Anduril its first check. It all dates back to a key introduction. Fubini is a Carnegie Mellon grad who cofounded an enterprise company, CubeTree, that a…