test(remap_file_pages): harden mem handler lock-in test

Audit of remap_file_pages(2): int remap_file_pages(void *addr,
size_t size, int prot, size_t pgoff, int flags). The implementation
was already correct (KindMem, FamilyMemory, addr=args[0],
length=args[1], length2=pgoff=args[3], flags=args[4]), but the
lock-in test was thinner than its madvise/mincore/munlock siblings.

Strengthen TestGenerateMemHandlerRemapFilePages to:
- negative-assert flags is never read from args[2] (prot, always 0)
  or args[0] (addr), guarding the prot/flags index hazard
- verify the exit handler captures the int 0/-1 status generically as
  UNCLASSIFIED, like every other KindMem exit
- document the wiring and the prot-vs-flags pitfall in the comment

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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