CDN-193: The Selector Must Turn

CDN-193 follows CDN-192 by testing whether the missing D9 floor selector can be a universal acoustic wave-number rule, a source-moment kernel, or a monotone one-dimensional branch feature. The best universal selector recovers the low and mid floors within tolerance, but misses the high-xi branch, which requires almost twice the selected acoustic wave number. The selector is therefore constrained but not derived: D9 remains unpaid, and the missing object is a branch-splitting spectral kernel or hidden state variable.