php-in-php: finish JitRename libc defer + AOT is_file kernel (#19215)

[PurHur]

Summary

• Finish php-in-php: delete JitRename libc defer bridge — route user-script AOT through JitVmHelperLink + RenameJitHelper PHP (#1492) #19215: JitRename::invokeLibc deleted; user-script AOT rename via thin JitRenameKernel libc; embed keeps RenameJitHelper via JitVmHelperLink.
• Unblock AOT RenameBuiltinTest: user-script is_file/file_exists were always false because nested StatPathJitHelper saw VmStatPath as external stubs. StatPathRuntime now emits JitStatKernel (thin libc stat/access) under UserScriptAotDeferNestedJit.
• Inventory/spine refreshed for new kernel units (OK 4923/4923).

Closes #19215.

Lines removed / C surface

• Removed JitRename::invokeLibc (~20 lines inline libc LLVM) — prior commit on this lineage.
• Added small documented kernels (JitRenameKernel, JitStatKernel) instead of growing JitStat glibc layout (php-in-php: JitStat — route is_file/is_dir/file_exists/is_link LLVM through VmStatPath not libc stat FFI (#1492, pairs #8903) #9112 shrink preserved).

Verification

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
php vendor/bin/phpunit test/unit/RenameRuntimeShrinkTest.php
php vendor/bin/phpunit test/unit/StatPathRuntimeShrinkTest.php
php vendor/bin/phpunit test/unit/VmFsPathPureRuntimeShrinkTest.php
php vendor/bin/phpunit test/unit/RenameBuiltinTest.php
php script/bootstrap-inventory.php --check
make bootstrap-selfhost-vm-driver-execute-probe
'

RenameRuntimeShrinkTest — OK (5 tests, 1 skipped under Zend)
StatPathRuntimeShrinkTest — OK (4 tests)
VmFsPathPureRuntimeShrinkTest — OK (4 tests)
RenameBuiltinTest — OK (2 tests) including testAotNativeBinaryMatchesPhpSubset
bootstrap-inventory --check — OK 4923/4923
bootstrap-selfhost-vm-driver-execute-probe — OK

php-src ref: ext/standard/filestat.c (php_rename, path predicates).

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