init: ROS2 learning suite

src/bringup/launch/action_launch.py

@@ -0,0 +1,20 @@
+"""
+action_launch.py —— 启动 Fibonacci Action 服务端。
+
+client 不在此 launch,按需手动调用:
+    ros2 action send_goal /fibonacci example_interfaces/action/Fibonacci "{order: 8}" --feedback
+"""
+
+from launch import LaunchDescription
+from launch_ros.actions import Node
+
+
+def generate_launch_description():
+    return LaunchDescription([
+        Node(
+            package='py_action_demo',
+            executable='fibonacci_server',
+            name='fibonacci_action_server_py',
+            output='screen',
+        ),
+    ])