fix(vm): try/finally execution — return defers through finally (#3082)

[PurHur]

Summary

Closes #3082.

• Normal try/finally and try/catch/finally on throw already worked on master; added compliance PHPTs.
• Gap fixed: return / return $v inside try now runs pending finally handlers first (including nested try), matching Zend unwind semantics.
• Mark the handler’s finally complete when leaving the finally CFG block so end-of-script return does not re-run finally.

php-src reference

• Zend/zend_exceptions.c — zend_execute_finally()
• Zend/zend_compile.c — try/finally CFG

Verification

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && vendor/bin/phpunit test/unit/TryCatchComplianceTest.php'
./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && vendor/bin/phpunit test/compliance/VMTest.php --filter "try_finally|try_catch_finally"'
./script/docker-exec.sh -- bash -lc 'source script/php-env.sh; php bin/vm.php -r "try { echo \"t\"; return; } finally { echo \"f\"; }"'
# tf

JIT follow-up remains in #2114.

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