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>

examples/rejected/module_var.ludic

@@ -0,0 +1,7 @@
+# 0.S: a module-level var is refused - a module's changing data is its state
+program ModuleVar {
+  var count: int = 0
+  entry {
+    print(count)
+  }
+}