AR in Osteotomy Planner

Implementation of Slicer AR visualization on an iPad.

We want to develop a small prototype in which we can display a superimposed view of virtual 3D models with the resection plan onto the real patient.
We want to highlight both positional and rotational discrepancies between the surgical plan and current cutting plane.

Start by reviewing the existing 3D Slicer extension and determining how an iPad AR prototype could display its 3D resection plan over the real patient. No files or tests are named, so first define the integration entry point and prototype scope. Done should include superimposed models plus visible positional and rotational discrepancies against the cutting plane.

Written by the indexing model from the issue text.