Parallel Selector
Finish when one child succeeds
Parallel Selector starts all children together and returns Success as soon as one child succeeds. It returns Failure if every child fails. When the Composite finishes, its remaining Running children are stopped.
This makes it useful for races: run a long operation beside a timer, or run movement beside a completion condition. Verify that stopping the losing branch is safe and that its OnEnd releases any animation, navigation, or subscription state.