fix: Stdlib charset aliases stay Alias nodes in class context

resolve_charset never consulted Stdlib, so digit/boundary-style
aliases in constraints degraded to vacuous fragments — moct-kor and
the rok-2011 maps never inserted the space before digits
("평리1동" -> "Pyeongniil-dong" instead of "Pyeongni Il-dong").
Resolving Stdlib values through the Any path also escaped their
regex fragments ([\\d] would match a literal backslash or d) —
Stdlib aliases resolve to Alias nodes, which the runtimes
interpolate raw.

Author: ronaldtse

lib/interscript/isc/node_adapter.rb

@@ -246,7 +246,13 @@ def resolve_charset(name)
 
         @resolving << name
         node =
-          if (imp = @imported[name])
+          # Stdlib alias values are regex fragments ("\d", "\b") —
+          # keep them as Alias nodes so the runtimes interpolate them raw;
+          # wrapping in Any escapes the backslashes ([\\d] matches a
+          # literal backslash or d).
+          if Interscript::Stdlib::ALIASES.key?(name)
+            Interscript::Node::Item::Alias.new(name)
+          elsif (imp = @imported[name])
             data = imp.data
             case data
             when Interscript::Node::Item::Any