Automatic finalizer execution

Run an original State# RealWorld -> (# State# RealWorld, a #) action through GHC's automatic finalizer policy, discarding its lifted result without evaluating it. Each invocation runs the action once; the action remains reusable. This does not claim or retire a weak registration.

GHC labels the executing thread, reports action exceptions to its current finalizer exception handler, and ignores exceptions thrown by that handler. The handler is read when an exception occurs, not when this action is built. Callers must supply a genuine IO state transformer and retain its owning runtime context throughout execution; state tokens must not be fabricated.