fix: module syntax — changed src_bux/*.bux from module X; to module X { ... }

src_bux/types.bux

@@ -1,5 +1,5 @@
 // types.bux — Type system definitions and factories
-module Types;
+module Types {
 
 // ---------------------------------------------------------------------------
 // TypeKind constants
@@ -184,4 +184,4 @@ func Type_ToString(t: Type) -> String {
     if t.kind == tkTypeParam { return t.name; }
     if t.kind == tkPointer { return "*" + t.innerName1; }
     return "?";
-}
+}