Huge amount of work. Does not even nearly compile, but it's nearer.

src/c/memory/stack.c

@@ -1,38 +0,0 @@
-/**
- *  memory/stack.c
- *
- *  The execution stack.
- *
- *  (c) 2026 Simon Brooke <simon@journeyman.cc>
- *  Licensed under GPL version 2.0, or, at your option, any later version.
- */
-
-#include "memory/stack.h"
-
-/** 
- * @brief The maximum depth of stack before we throw an exception.
- *
- * `0` is interpeted as `unlimited`.
- */
-uint32_t stack_limit = 0;
-
-/**
- * Fetch a pointer to the value of the local variable at this index.
- */
-struct cons_pointer fetch_arg( struct stack_frame *frame, unsigned int index ) {
-    struct cons_pointer result = NIL;
-
-    if ( index < args_in_frame ) {
-        result = frame->arg[index];
-    } else {
-        struct cons_pointer p = frame->more;
-
-        for ( int i = args_in_frame; i < index; i++ ) {
-            p = pointer2cell( p ).payload.cons.cdr;
-        }
-
-        result = pointer2cell( p ).payload.cons.car;
-    }
-
-    return result;
-}