Language: reject self/parent/static::method in free functions (#32227)

[PurHur]

Summary

• Closes Language: static::/self::/parent:: method call in function compiles — Zend Cannot use "static" when no class scope is active (Zend/zend_compile.c) #32227: self:: / parent:: / static:: method calls (and static::class) inside a named free function are now a compile-time fatal matching Zend zend_ensure_valid_class_fetch_type().
• php-src: Zend/zend_compile.c — Cannot use "%s" when no class scope is active. PHP implementation: lib/Compiler.php (rejectPseudoClassFetchOutsideKnownClassScope) + existing PseudoClassTypeHintCompileCheck::messageFor().
• File-level scripts and closures still compile (Zend zend_is_scope_known(): they inherit include/eval scope or can be rebound). No new runtime/*.c logic.

Test plan

• Issue repro VM + JIT (rc=255, Zend substring, never prints accepted)
• ./script/phpunit.sh --filter PseudoClassCallNoScope32227
• ./script/phpunit.sh --filter PseudoClassStaticCallCompileFatalTest
• php script/bootstrap-inventory.php --check → OK 7590/7590 (Docker regen; no gen-0 restamp)

Verification

./script/docker-exec.sh -- bash -lc 'php bin/vm.php test/repro/maintainer_gap_static_call_no_scope.php >/tmp/o.txt 2>&1; echo RC:$?; cat /tmp/o.txt'

RC:255
PHP Fatal error:  Cannot use "static" when no class scope is active in /compiler/test/repro/maintainer_gap_static_call_no_scope.php on line 8

Same Zend substring + rc=255 for maintainer_gap_self_call_no_scope.php, maintainer_gap_parent_call_no_scope.php, and php bin/jit.php on the static repro.

./script/phpunit.sh --filter 'PseudoClassCallNoScope32227|PseudoClassStaticCallCompileFatalTest|PseudoClassGlobalScopeCompileTest'

OK (18 tests, 36 assertions)

./script/docker-exec.sh -- bash -lc 'php script/bootstrap-inventory.php --check'

OK 7590/7590

Did not run full make test-harness or north-star5-verify --strict.

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