Fix wave 12 bootstrap array ops AOT lowering (#1112)

[PurHur]

Summary

• Register wave 12 array builtins (array_push, array_unshift, array_filter, array_combine, sort, compact, extract, etc.) in SelfHostBuiltinPolicy::CATEGORY_ARRAY so self-host AOT uses real Internal JIT lowering instead of ExternalMethod stubs.
• Fix hashtable persistence: set packed-list metadata after materializeNativeArrayForCall, re-box native arrays as TYPE_VALUE after in-place mutation, and write back after sort().
• Add unit test guarding wave 12 array ops stay on real lowering under PHP_COMPILER_SELFHOST_AOT=1.

Closes #1112 (partial — wave 12 bootstrap array fixtures). Supersedes #1151.

Verification (Docker, tar sync — harness bind-mount stale)

tar -cf - --exclude='.git' --exclude='.llvm' . | docker run --rm -i -w /compiler -m 10g \
  -e PHP_COMPILER_CI_RAM_GB=8 -e PHP_COMPILER_MEMORY_LIMIT=1536M \
  php-compiler:22.04-dev bash -c 'tar -xf - -C /compiler && source script/ci-defaults.env && export PHP_COMPILER_LLVM_PATH=/compiler/.llvm && php vendor/bin/phpunit test/unit/SelfHostBuiltinPolicyTest.php && php -d memory_limit=1536M bin/compile.php -o /tmp/ops test/bootstrap-aot/stdlib_array_ops.php && /tmp/ops'

Expected stdout: 42671 (matches Zend).

Test plan

• SelfHostBuiltinPolicyTest (4 tests)
• stdlib_array_ops.php AOT compile + execute matches Zend
• Full ./script/ci-local.sh (master currently has unrelated fast-suite failures in this harness)

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