Comprehensive ROS 2 engineering guide covering workspace setup, node architecture, communication patterns (topics/services/actions with QoS), lifecycle and component nodes, launch composition, tf2/URDF, ros2_control hardware interfaces, real-time constraints, Nav2, MoveIt 2, perception pipelines, simulation (Gazebo/Isaac Sim), security (SROS2/DDS), micro-ROS (MCU/RTOS), multi-robot systems (fleet management/Open-RMF), testing, debugging, deployment, and ROS 1 migration. Trigger whenever the user
