{
  "mode": "restructure",
  "input_stage": "/tmp/factory.usd",
  "output_dir": "/tmp/factory",
  "new_assembly_root": "/tmp/factory/factory.optimized.usdc",
  "phase4_targets": [
    {
      "path": "/tmp/factory/prototypes/rack_unit.usd",
      "target_class": "prototype",
      "mesh_count": 412,
      "dependency_group": "shared_first",
      "source": "/World/Racks/Rack_01"
    },
    {
      "path": "/tmp/factory/factory.optimized.usdc",
      "target_class": "assembly_root",
      "mesh_count": 1840,
      "dependency_group": "dependent_after",
      "source": "/World"
    }
  ]
}