xstate query signal should probably not be sent in standalone mode

In standalone mode the query signal from #1937 (closed) is still sent during initialization. This doesn't seem ideal, to have a SIGILL show up and complicate debugging, given that we disallow use of try/except when in standalone mode (presumably that includes safe reads and writes too and other uses of signals).

What about the TLS magic read? I'm not 100% sure that's avoided in standalone mode. This issue covers investigating and disabling the query signal for standalone_library.