Stdlib: curl_escape/unescape(null) TypeError on PROFILE=8.4 (#20695)

[PurHur]

Summary

• Route curl_escape / curl_unescape $string through VmString::coerceZparamStrBuiltinArg + JitStringBuiltinArg::lowerZparamStr so null TypeErrors under PHP_COMPILER_PROFILE=8.4 (php-src-strict; matches urlencode).
• AOT early-return on constant null avoids linking __string__rawurlencode after TypeError+abort.
• Compliance + AOT fixtures; 8.2 profile still coerces to ''.

Closes #20695

php-src reference

• ext/curl/interface.c — curl_escape / curl_unescape (string $string non-nullable)

PHP implementation

• ext/curl/curl_escape.php, ext/curl/curl_unescape.php

Verification

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
PHP_COMPILER_PROFILE=8.4 php bin/vm.php -r "…"   # TypeError ×2
PHP_COMPILER_PROFILE=8.4 php bin/jit.php -r "…"  # TypeError ×2
PHP_COMPILER_PROFILE=8.2 php bin/vm.php -r "…"   # '' ''
PHP_COMPILER_HELPER_RUNTIME_O=1 PHP_COMPILER_PROFILE=8.4 php bin/compile.php -o /tmp/x /tmp/curl_escape_null84.php && /tmp/x
# compile_exit=0 run_exit=255 TypeError
vendor/bin/phpunit --filter "curl_escape_null|CurlEscapeBuiltin"
# OK (8 tests)
vendor/bin/phpunit test/aot/AotTest.php --filter curl_escape_null_forward84
# OK (1 test)
'

Pillar 1 (pre-claim)

Gate	Result
inventory	OK 5799/5799
release-readiness --json	user_release_ready: yes
north-star5-fast	ok
vm-driver-probe	ok

Test plan

• VM PROFILE=8.4 TypeError
• JIT PROFILE=8.4 TypeError
• AOT PROFILE=8.4 exit 255 TypeError
• PROFILE=8.2 still coerces
• compliance + AotTest filters green

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