php-in-php: VmFs readlink/symlink/touch — drop host @readlink/@symlink/@touch (#8430)

[PurHur]

Summary

• Route VM readlink() / symlink() through VmFsPathNative libc readlink(2) / symlinkat(2) FFI (pairs existing JitReadlink / JitSymlink).
• Add VmFsTouchNative with stat/open/utime parity to StringFsDirJit::emitTouch; VmFs::touch() no longer calls host @touch().
• Extend runtime-shrink unit tests; wire VmFsTouchNative into spine smoke require_once list.
• C runtime: 0 lines added (lib/AOT/runtime/phpc_progress.c unchanged).

php-src reference

• ext/standard/link.c — readlink/symlink
• ext/standard/filestat.c — php_touch

Verification

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && vendor/bin/phpunit --filter "VmFsRuntimeShrink|VmFsPathNative|TouchBuiltinTest::testVm|ReadlinkBuiltinTest::testVm" test/unit/'
# OK (12 tests, 79 assertions)

make bootstrap-selfhost-link
# bootstrap-selfhost-link: OK build/selfhost

grep -n '@readlink\|@symlink\|@touch' ext/standard/VmFs.php || echo "no host delegation"
# no host delegation

Closes #8430

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