[PurHur]

Summary

• Add ext/sysvsem/ module with sem_get(), sem_acquire(), sem_release(), and sem_remove() builtins
• Follow the ext/sysvshm host-delegation pattern: VM SysvSemaphore objects wrap host handles
• Register module in Runtime.php and capability matrix; add compliance guard

php-src reference: ext/sysvsem/sysvsem.c (zif_sem_get, zif_sem_acquire, zif_sem_release, zif_sem_remove)

Closes #3704

Test plan

Issue repro + targeted PHPUnit:

php bin/vm.php -r 'var_dump(function_exists("sem_get"), function_exists("sem_acquire"));'
# bool(true) bool(true)

php bin/vm.php test/compliance/cases/stdlib/sem_acquire_release.phpt
# fn / SysvSemaphore / acq / rel / done

vendor/bin/phpunit --filter SysvSemBuiltinTest
# OK (1 test, 1 assertion)

Verification output (2026-07-14):

bool(true)
bool(true)
fn
SysvSemaphore
acq
rel
done
OK (1 test, 1 assertion)

JIT/AOT deferred (VM-only v1, same as #3344 sysvshm).

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