Prerequisite Verification: Enter and Inspect a ROS 2 Jazzy Runtime

This route no longer serves as a full beginner ROS 2 graph lesson. ros2-for-students is the prerequisite for environment sourcing, nodes, topics, parameters, services, and basic CLI introspection.

The bridge task is to prove that prerequisite knowledge is active before cross-layer diagnosis begins.

From a clean shell, verify:

• the Jazzy environment is sourced;
• expected nodes are visible;
• selected graph relationships are inspectable;
• one parameter/configuration value is observable;
• you can state what none of those observations prove about Java/WPILib execution or physical hardware.

The important boundary is:

ROS graph presence
!= Java object existence
!= WPILib subsystem state
!= actuator response

Required checkpoint

Produce a compact ROS Runtime Verification Record with sourced-shell evidence, node/topic inventory, one inspected relationship, one parameter observation, and one explicitly unsupported cross-layer claim.

If these CLI operations are unfamiliar, return to ros2-for-students instead of expanding this bridge route into another ROS foundation sequence.