wip(0.S1, 0.S2): state records, mut and read-only state parameters, entry injection, module var refused; ludic migrate state

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

selfhost/check/check_gen.ludic

@@ -88,6 +88,9 @@ function gen_clone(n: Node, tps: []pointer, args: []pointer) -> Node {
   c.line = n.line
   c.file = n.file
   c.vis = n.vis
+  c.uns = n.uns
+  c.pos = n.pos
+  c.pos2 = n.pos2
   c.a = gen_clone(n.a, tps, args)
   c.b = gen_clone(n.b, tps, args)
   c.c = gen_clone(n.c, tps, args)