Xml.free gives back a parsed tree's records and lists (never its strings) and the parser's cursor is freed; ludic.ui frees a template's XML once built, sel_parse's and ex_parse's readers, lss_rule's declarations holder, and px_cmp no longer makes a list of its operators per call

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

runtime/native/namespaces.ludic

@@ -495,6 +495,7 @@ namespace Json {
 }
 namespace Xml {
   alias parse(text) = xml_parse
+  alias free(node) = xml_free          # the tree's records and lists; its strings are kept
   alias tag(node) = xml_tag
   alias text(node) = xml_text
   alias attr(node, key) = xml_attr