refactor: + xo-stringtable2 w/ DString impl

include/xo/stringtable2/stringtable2_register_facets.hpp

@@ -0,0 +1,15 @@
+/** @file stringtable2_register_facets.hpp
+ *
+ *  @author Roland Conybeare, Mar 2026
+ **/
+
+#pragma once
+
+namespace xo {
+    namespace scm {
+        /** Register object2 (facet,impl) combinations with FacetRegistry **/
+        bool stringtable2_register_facets();
+    }
+}
+
+/* end stringtable2_register_facets.hpp */