remove detection from the node

dora-zed publishes camera data only. The two engines under src/engines/, the
objects output, the ZED_ENGINE/ZED_DETECTION_*/ZED_ONNX_* variables and the
ZED_PC_MODE=ROI crop are gone, along with the standalone engine test and the
model export script.

This drops the unconditional ONNX Runtime requirement from CMakeLists, the
Dockerfile and the install scripts, so the node now configures on a machine
with no ONNX Runtime — which is what blocked the Jetson build, since there is
no official ARM64 GPU binary.

zed_native is dropped rather than kept: it is bound to the live camera handle
and cannot run in a node that receives images over a dataflow. The removed
code remains reachable at tag v0.1.0.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Y7g2cBJ5e3r15ZbJ9WZn8c

CMakeLists.txt

@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 3.21)
-project(dora_zed VERSION 0.1.0 LANGUAGES C CXX)
+project(dora_zed VERSION 0.2.0 LANGUAGES C CXX)
 
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_FLAGS "-fPIC")
@@ -19,18 +19,12 @@ find_package(zed REQUIRED)
 
 find_package(OpenCV REQUIRED)
 
-find_package(onnxruntime REQUIRED)
-set(ONNXRUNTIME_INCLUDE_DIRS "")  # propagated via imported target
-set(ONNXRUNTIME_LIBRARIES onnxruntime::onnxruntime)
-
 link_directories(${dora_link_dirs})
 link_directories(${ZED_LIBRARY_DIR})
 
 add_executable(dora_zed
     src/main.cc
     src/zed/camera.cc
-    src/engines/zed_native.cc
-    src/engines/yolo_onnx.cc
     ${node_bridge}
 )
 add_dependencies(dora_zed Dora_cxx)
@@ -44,29 +38,8 @@ target_include_directories(
         ${ZED_INCLUDE_DIRS}
         ${OpenCV_INCLUDE_DIRS}
         ${CUDAToolkit_INCLUDE_DIRS}
-        ${ONNXRUNTIME_INCLUDE_DIRS}
 )
 
-target_link_libraries(dora_zed dora_node_api_cxx ${ZED_LIBRARIES} ${OpenCV_LIBS} ${ONNXRUNTIME_LIBRARIES})
+target_link_libraries(dora_zed dora_node_api_cxx ${ZED_LIBRARIES} ${OpenCV_LIBS})
 
 install(TARGETS dora_zed DESTINATION ${CMAKE_CURRENT_SOURCE_DIR}/bin)
-
-# Standalone detector tests — no dora, no live camera required
-
-add_executable(test_yolo_onnx
-    src/test_yolo_onnx.cc
-    src/engines/yolo_onnx.cc
-)
-target_include_directories(test_yolo_onnx PRIVATE
-    ${CMAKE_CURRENT_SOURCE_DIR}/src
-    ${ZED_INCLUDE_DIRS}
-    ${OpenCV_INCLUDE_DIRS}
-    ${CUDAToolkit_INCLUDE_DIRS}
-    ${ONNXRUNTIME_INCLUDE_DIRS}
-)
-target_link_libraries(test_yolo_onnx PRIVATE
-    ${ZED_LIBRARIES}
-    ${OpenCV_LIBS}
-    ${ONNXRUNTIME_LIBRARIES}
-)
-install(TARGETS test_yolo_onnx DESTINATION ${CMAKE_CURRENT_SOURCE_DIR}/bin)