Got most of the new memory architecture roughed out.

src/c/payloads/vector_pointer.h

@@ -0,0 +1,39 @@
+/**
+ *  payloads/vector_pointer.h
+ *
+ *  A pointer to an object in vector space.
+ *
+ *  (c) 2026 Simon Brooke <simon@journeyman.cc>
+ *  Licensed under GPL version 2.0, or, at your option, any later version.
+ */
+
+#ifndef __psse_payloads_vector_pointer_h
+#define __psse_payloads_vector_pointer_h
+
+#include "memory/pointer.h"
+
+/**
+ * A pointer to an object in vector space.
+ */
+#define VECTORPOINTTAG  "VSP"
+
+/**
+ * @brief payload of a vector pointer cell.
+ */
+struct vectorp_payload {
+    /** the tag of the vector-space object. NOTE that the vector space object
+     * should itself have the identical tag. */
+    union {
+        /** the tag (type) of the vector-space object this cell
+         * points to, considered as bytes. */
+        char bytes[TAGLENGTH];
+        /** the tag considered as a number */
+        uint32_t value;
+    } tag;
+    /** unused padding to word-align the address */
+    uint32_t padding;
+    /** the address of the actual vector space object */
+    void *address;
+};
+
+#endif