[PurHur]

Summary

• Implement openssl_pbkdf2() in ext/openssl/ using existing VmHashNative::hashPbkdf2() (php-src ext/openssl/kdf.c parity; PHP-in-PHP, no new C runtime).
• Register on openssl module + self-host spine; add compliance PHPT and maintainer repro.

Note: openssl_pbkdf2_scrypt() is not in php-src PHP-8.4 openssl.stub.php (only openssl_pbkdf2); scrypt left for a follow-up if/when php-src adds it.

php-src reference

• ext/openssl/kdf.c — PHP_FUNCTION(openssl_pbkdf2)

Verification

php bin/vm.php test/repro/maintainer_gap_openssl_pbkdf2.php
# ok

vendor/bin/phpunit --filter 'OpensslModuleTest|openssl_pbkdf2'
# OK (8 tests, 27 assertions)

php script/bootstrap-inventory.php --check
# OK 4474/4474

./script/ci-fast.sh
# exit 0

Closes #6488

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