DepthFinder requires circuit depth to be independent of num_slots

The DepthFinder evaluator hard codes the number of slots to 4096. If the depth of the circuit depends on this parameter, then the depth will always be reported for 4096 slots, but the user may wish to find the depth when num_slots is, e.g., 8192.

Start by locating the DepthFinder evaluator and the hard-coded 4096 slot value. Trace how num_slots reaches depth evaluation, then verify that the reported depth changes when the requested slot count changes, including the 8192 example; no test or file path is named in the issue.

Written by the indexing model from the issue text.