phase: 20.49 COMPLETE; 20.50 Flow+String minimal reps; 20.51 selfhost v0/v1 minimal (Option A/B); hv1-inline binop/unop/copy; docs + run_all + CURRENT_TASK -> 21.0

test_using.nyash

@@ -0,0 +1,7 @@
+using selfhost.vm.hv1.dispatch as NyVmDispatcherV1Box
+static box Main {
+  method main(args) {
+    print("Hello from using!")
+    return 42
+  }
+}