Consistency pass: fix util/memory.h include ordering, drop stray comment and unused include

util/memory.h had landed as the very first #include in ~30 files from the
mechanical memcpy/memcmp conversion, ahead of each file's own umbrella type
header - moves it back after, matching the rest of the codebase's ordering.
Also updates a scriptplatform.h comment left over from the int/fixed/bignum
split, and drops an unused util/string.h include in scriptcompile.c.

Co-Authored-By: Claude Sonnet 5 <[email protected]>

src/duskscriptcc/compile/expression/scriptcompileliteral.c

@@ -5,8 +5,8 @@
  * https://opensource.org/licenses/MIT
  */
 
-#include "util/memory.h"
 #include "scriptcompiletypes.h"
+#include "util/memory.h"
 #include "expression/scriptcompileliteral.h"
 #include "builder/scriptbuilderemit.h"
 #include "builder/scriptbuilderstring.h"