php-in-php: move PregMatchUserScriptLlvm stubs to JitPregMatchKernel (#19399)

[PurHur]

Summary

• Move user-script AOT __compiler_preg_* stubs from lib/JIT/Builtin/PregMatchUserScriptLlvm.php into ext/standard/JitPregMatchKernel.php (same kernel-move pattern as php-in-php: move StringHtmlspecialcharsUserScriptLlvm → JitHtmlspecialcharsKernel in ext/standard (#1492) #19389 / php-in-php: move StringGetenv deferred libc getenv → JitGetenvKernel in ext/standard (#1492) #19373)
• Wire PregMatchRuntime defer path through JitPregMatchKernel::implement
• Restore Pillar 1 trust: add missing ext/sockets/socket_select.php to spine (drift from Stdlib: socket_select() via poll(2) thin FFI (#6395) #19390)

Closes #19399

LOC

• Deleted lib/JIT/Builtin/PregMatchUserScriptLlvm.php (~134 LOC from Builtin surface)
• Added ext/standard/JitPregMatchKernel.php (same stubs, housed in ext/)

Verification

$ vendor/bin/phpunit test/unit/PregMatchUserScriptLlvmTest.php test/unit/PregMatchRuntimeShrinkTest.php test/unit/PregPrelinkDeferRuntimeTest.php
OK (3 tests, 12 assertions)

$ php script/bootstrap-inventory.php --check
OK 5030/5030

$ php script/check-selfhost-spine-coverage-sync.php
check-selfhost-spine-coverage-sync: OK (spine covers all 5030 inventory files)

$ make bootstrap-selfhost-vm-driver-execute-probe
bootstrap-selfhost-vm-driver-execute-probe: OK

$ make north-star5-verify-fast
north-star5-verify: OK (fast)

Test plan

• Unit shrink / defer tests
• Spine coverage sync (incl. socket_select)
• Inventory check
• VM driver execute probe
• north-star5-verify-fast

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