[PurHur]

Summary

• Thin-AOT snapshots ParentIterator / MultipleIterator / RecursiveTreeIterator into __spl_ht via pure LLVM (NestedJIT HashTable bridges segfault under standalone AOT — peer Regression: AOT LimitIterator/AppendIterator fail — missing __generator_resume metadata (ext/spl/spl_iterators.c) #26825).
• Extend VmIteratorForeach::usesArrayIteratorHt() so foreach walks the snapshot instead of falling through to a bad object→HT path (that was the ParentIterator segfault).
• php-src: ext/spl/spl_iterators.c — ParentIterator filter, MultipleIterator zip rows, RecursiveTreeIterator default prefixes.

Test plan

• Issue repro Zend / VM / AOT ×3 — all print:

  Parent:b 
  Multi:a:1 b:2 
  Tree:\-Array|  |-1|  \-2|
  

  Commands:

  ./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
  cp test/repro/spl_wrap_iterators_foreach_aot.php /tmp/spl_wrap.php
  php /tmp/spl_wrap.php
  php bin/vm.php /tmp/spl_wrap.php
  ./phpc build -o /tmp/spl_wrap /tmp/spl_wrap.php
  for i in 1 2 3; do /tmp/spl_wrap; done'

• vendor/bin/phpunit --filter spl_wrap_iterators_foreach — OK (1 test)
• php script/bootstrap-inventory.php --check — OK 7004/7004
• php script/check-selfhost-spine-coverage-sync.php — OK
• Gen-0 sidecar stamp intentionally stale after spine require adds (same pattern as Stdlib: AOT FilterIterator subclass current()/accept fetch (#27565) #27651); trust follow-up refreshes prelinked/bootstrap-gen0/

Closes #27584

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