php-in-php: StringHashCryptoJit NestedJit defer → thin standalone (#20065)

[PurHur]

Summary

• Closes php-in-php: delete StringHashCryptoJit NestedJit defer — thin via isThinStandaloneAotMain + real hash_equals (re-#20050) #20065 — replace UserScriptAotDeferNestedJit on StringHashCryptoJit with isThinStandaloneAotMain (php-in-php: delete StringHashAlgos/HmacAlgos NestedJit defer — thin standalone via JitHashAlgosKernel (re-#19355) #20050 / Rename shape)
• Delete always-false hash_equals_deferred_stub; thin AOT uses new JitHashEqualsKernel timing-safe XOR + existing JitHashCryptoKernel
• Embed/non-thin keeps HashEqualsJitHelper / StringHashCryptoPhp via JitVmHelperLink
• Net shrink: NestedJit defer call sites removed from StringHashCryptoJit / unused import from StringHashCryptoPhp; inventory 5415 (+1 kernel)

php-src reference

• php/php-src ext/hash/hash.c — hash_equals / PHP_FUNCTION(hash)

Test plan

• vendor/bin/phpunit shrink + standalone + HashEqualsBuiltin tests
• User-script AOT: PHP_COMPILER_AOT_USER_SCRIPT=1 ./phpc build hash_equals → 1\n0
• php script/bootstrap-inventory.php --check → OK 5415/5415
• php script/check-selfhost-spine-coverage-sync.php → OK
• make bootstrap-selfhost-vm-driver-execute-probe
• make north-star5-verify-fast (running)

Verification transcript

OK StringHashEqualsRuntimeShrinkTest (5)
OK StringHashCryptoRuntimeShrinkTest
OK StringHashCryptoRuntimeStandaloneTest (incl. thin user-script kernel entry)
OK HashEqualsBuiltinTest
user-script AOT hash_equals OK (OUT=1\n0)
bootstrap-selfhost-vm-driver-execute-probe OK
inventory OK 5415/5415

Refs #1492, #20050, #19362, #10533

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