Add optional ROS2 dependency support via find_package

[Copilot]

Request was to add ROS2 as a CMake dependency using FetchContent. ROS2's ament_cmake build system has complex interdependencies that prevent standalone fetching—find_package() is the standard integration method.

Changes

• CMakeLists.txt: Added BUILD_ROS2_SUPPORT option (OFF by default), finds rclcpp and std_msgs when enabled
• tests/CMakeLists.txt: Conditional ros2_dependency_tests target linked against ROS2 libraries
• tests/test_ros2_dependency.cpp: Test fixture verifying rclcpp init, node creation, and std_msgs availability

Usage

source /opt/ros/humble/setup.bash
cmake -DBUILD_ROS2_SUPPORT=ON -DBUILD_TESTS=ON ..
cmake --build .
ctest

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• esm.ubuntu.com
  • Triggering command: /usr/lib/apt/methods/https /usr/lib/apt/methods/https (dns block)
• gitlab.com
  • Triggering command: /usr/lib/git-core/git-remote-https /usr/lib/git-core/git-remote-https origin REDACTED (dns block)
  • Triggering command: /usr/lib/git-core/git-remote-https /usr/lib/git-core/git-remote-https origin REDACTED tail -20 rchives/libeigen3-dev_3.4.0-4buiamswarm/CMakeFiles/AMSwarm.dir/constraint.cpp.o p.ci /usr/bin/gdbus /REDACTED/work/AMSgit (dns block)
  • Triggering command: /usr/lib/git-core/git-remote-https /usr/lib/git-core/git-remote-https origin REDACTED /usr/bin/dpkg --fo�� ompilerABI.cpp.o -o cmTC_0be8d && : --force-confdef estamp --print-foreign-git (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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