Stdlib: shm_attach()/shm_get_var()/shm_put_var()/shm_remove_var()/shm_detach() — ext/sysvshm (#6436)

[PurHur]

Summary

• Adds new ext/sysvshm/ module with all five legacy System V shared-memory API functions.
• PHP-in-PHP: VM SysvSharedMemory objects bridge to host SysvSharedMemory segments via VmSysvShm (no new C runtime logic).
• php-src reference: ext/sysvshm/sysvshm.c

Closes #6436

Verification

Issue repro (Docker):

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
php bin/vm.php -r "echo function_exists(\"shm_attach\")?\"yes\":\"no\";"
php bin/vm.php -r "
\$shm_id = @shm_attach(0x6436, 1024, 0644);
shm_put_var(\$shm_id, 1, \"hello\");
echo shm_get_var(\$shm_id, 1), \"\n\";
shm_remove_var(\$shm_id, 1);
shm_detach(\$shm_id);
"'

Output:

yes
hello

Compliance + inventory:

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
vendor/bin/phpunit --filter SysvShmBuiltinTest
php script/bootstrap-inventory.php --check'

Output:

OK (1 test, 1 assertion)
OK 4792/4792

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