Got most of the new memory architecture roughed out.

src/c/payloads/free.h

@@ -0,0 +1,30 @@
+/**
+ *  payloads/free.h
+ *
+ *  An unassigned object, on a freelist; may be of any size class.
+ *
+ *  (c) 2026 Simon Brooke <simon@journeyman.cc>
+ *  Licensed under GPL version 2.0, or, at your option, any later version.
+ */
+
+#ifndef __psse_payloads_free_h
+#define __psse_payloads_free_h
+
+#include "memory/pointer.h"
+
+/**
+ * @brief Tag for an unassigned object; may be of any size class.
+ */
+#define FREETAG     "FRE"
+
+/**
+ * @brief An unassigned object, on a freelist; may be of any size class.
+ * 
+ */
+struct free_payload {
+  /** the next object on the free list for my size class */
+    struct pso_pointer next;
+};
+
+
+#endif