CMake: add hdCycles Hydra delegate build and deployment

- Build Cycles from third_party/cycles via ExternalProject (WITH_CYCLES=ON)
- Deploy hdCycles.dll + plugin metadata to usd/ alongside hdEmbree/hdArnold
- Copy Cycles runtime deps (embree4, openvdb, OIDN, sycl, imath, etc.) via
  a cmake -P script that globs at build time, excluding CRT DLLs to avoid
  MSVCP140 version conflicts
- Deploy tbb12.dll explicitly from the precompiled lib tree (required by
  openvdb/embree4 but absent from the install output)
- Bake all renderer paths into CMakePresets.json default preset
  (WITH_CYCLES, HDARNOLD_ROOT -> E:/library/hdArnold, ARNOLD_LOCATION,
  HDEMBREE_USD_ROOT) so a fresh configure needs no manual -D flags

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

CMakePresets.json

@@ -13,7 +13,11 @@
         "IMGUI_DIR": "${sourceDir}/third_party/imgui-1.92.7",
         "CMAKE_CXX_STANDARD": "17",
         "CMAKE_CXX_STANDARD_REQUIRED": "ON",
-        "BUILD_TESTS": "ON"
+        "BUILD_TESTS": "ON",
+        "WITH_CYCLES": "ON",
+        "HDARNOLD_ROOT": "E:/library/hdArnold",
+        "ARNOLD_LOCATION": "C:/Autodesk/mtoa/5.5.0/2026",
+        "HDEMBREE_USD_ROOT": "E:/USD_v25.05_embree"
       }
     },
     {