xo-expression2: + IGCObject_DUniqueString + facet/type registration

include/xo/expression2/expression2_register_facets.hpp

@@ -0,0 +1,17 @@
+/** @file expression2_register_facets.hpp
+ *
+ *  @author Roland Conybeare, Jan 2026
+ **/
+
+#pragma once
+
+#include <xo/gc/Collector.hpp>
+
+namespace xo {
+    namespace scm {
+        /** Register expression2 (facet,impl) combinations with FacetRegistry **/
+        bool expression2_register_facets();
+    }
+}
+
+/* end expression2_register_facets.hpp */