iOS lock step keyboard + metal

examples/issue-0033-user.sx

@@ -0,0 +1,10 @@
+// User file uses xx but only imports the shared types — NOT the impl.
+// The Phase 4 visibility filter should reject the impl from issue-0033-impl.sx.
+#import "modules/std.sx";
+#import "./issue-0033-types.sx";
+
+run_user :: () -> s32 {
+  w : Wrap = xx 7;
+  print("user: w.v = {}\n", w.v);
+  0;
+}