TapContext
Ownership marker for suspending device calls. Installed by tapScope (scripts) and by the JUnit 5 tapTest bridge (which uses the same element with a junit:<method> owner); every suspending Device/App/Element/ElementWait call requires it. TapClient, TapConnection, DaemonDiscovery and TapDaemonProcess never require it: they set up the channel, the connection and the daemon process outside any test scope.