SCHEDULER: add register dumps

kernel/src/scheduler.rs

@@ -48,6 +48,7 @@ impl Scheduler<'_> {
 
             let mut prog = self.data.pop_front().unwrap();
             prog.run().unwrap();
+            log::trace!("VM registers {:?}", prog.registers);
             self.data.push_back(prog);
         }
     }