[PurHur]

Summary

• Fix gc_enabled.phpt and gc_collect_cycles.phpt compile failures (Mixed_ from untyped Node::$next) by using #[\AllowDynamicProperties] (same pattern as gc_collect_cycles_destruct.phpt).
• Add test/compliance/cases/stdlib/gc_jit.phpt covering JIT gc_enabled() toggle + gc_collect_cycles() on a two-node cycle.

GC JIT/AOT lowering was already landed via GcCollectCyclesRuntime / JitGcToggle / JitGcCollectCycles — this PR closes the open compliance gap from #4023.

C runtime: no changes; only phpc_progress.c remains under lib/AOT/runtime/.

php-src reference

• ext/standard/basic_functions.c — PHP_FUNCTION(gc_collect_cycles), gc_enable, gc_disable, gc_enabled
• Zend/zend_gc.c — cycle collector

Verification

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
vendor/bin/phpunit test/compliance/VMTest.php --filter "stdlib/gc_enabled"
vendor/bin/phpunit test/compliance/JITTest.php --filter "stdlib/gc_jit"
vendor/bin/phpunit test/compliance/VMTest.php --filter "runtime/gc_collect_cycles"
php bin/jit.php -r "echo gc_enabled() ? \"on\n\" : \"off\n\"; gc_disable(); echo gc_enabled() ? \"on\n\" : \"off\n\"; gc_enable(); echo gc_collect_cycles(), \"\n\";"
'

Output:

OK (1 test, 1 assertion)   # VM gc_enabled
OK (1 test, 1 assertion)   # JIT gc_jit
OK (1 test, 1 assertion)   # VM gc_collect_cycles
on
off
0

Note: AotTest::gc_enabled compile failure is pre-existing on master (not introduced here).

Closes #4023

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