xo-interpreter: + VSM work in progress

include/xo/interpreter2/DApplyFrame.hpp

@@ -0,0 +1,20 @@
+/** @file DApplyFrame.hpp
+ *
+ *  @author Roland Conyberae, Feb 2026
+ **/
+
+#pragma once
+
+namespace xo {
+    namespace scm {
+        /** In virtual schematika machine (VSM):
+         *  stack frame for interpreted apply expression
+         *  (@ref DApplyExpr)
+         **/
+        class DApplyFrame {
+            obj<AGCObject> 
+        };
+    }
+}
+
+/* end DApplyFrame.hpp */