Down to to compilation errors. Had to reinstate individual size-class headers.

src/c/memory/pso9.h

@@ -0,0 +1,32 @@
+/**
+ *  memory/pso9.h
+ *
+ *  Paged space object of size class 9, 512 words total, 510 words payload.
+ *
+ *  (c) 2026 Simon Brooke <simon@journeyman.cc>
+ *  Licensed under GPL version 2.0, or, at your option, any later version.
+ */
+
+#ifndef __psse_memory_pso9_h
+#define __psse_memory_pso9_h
+
+#include <stdint.h>
+
+#include "memory/header.h"
+#include "payloads/free.h"
+
+/**
+ * @brief A paged space object of size class 9, 512 words total, 510 words
+ * payload.
+ * 
+ */
+struct pso9 {
+    struct pso_header header;
+    union {
+        char bytes[4080];
+        uint64_t words[510];
+        struct free_payload free;
+    } payload;
+};
+
+#endif