Stdlib: sort() unit enum arrays preserve stable order (#16905)

[PurHur]

Summary

• sort() on unit enum case arrays now preserves stable insertion order when cases are incomparable — matches Zend/php-src array.c behavior (Stdlib: sort() on unit enum arrays reorders cases — must preserve stable order (ext/standard/array.c) #16905).
• EnumCaseSupport::compareEnumCasesForSort() returns 0 for distinct unit-enum cases (backed enums unchanged: object-handle order).
• Corrected sort_enum_cases.phpt EXPECT to match Zend output (unit B,A; EOrder C,A,B).
• Refreshed docs/bootstrap-inventory.md (GetDefinedExcludeDisabledJit.php on vm.php spine path).

php-src reference

• ext/standard/array.c — php_array_sort enum zval compare
• Zend/zend_enum.c — unit enum case handles

Verification

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
php bin/vm.php test/compliance/cases/stdlib/sort_enum_cases.phpt
php bin/vm.php test/repro-maintainer/parity_sort_enum_cases.php
vendor/bin/phpunit --filter SortEnumCasesBuiltinTest
php script/bootstrap-inventory.php --check
'

Output:

# sort_enum_cases.phpt — A B C / B A / A B / C A B (Zend match)
# parity_sort_enum_cases.php — unit enum array ends with EUnit::B, EUnit::A
# SortEnumCasesBuiltinTest — OK (6 tests)
# bootstrap-inventory --check — OK 4170/4170

Closes #16905

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