[PurHur]

Summary

• Migrate supportsClassHasFunctions(), supportsStrIncrement(), supportsJsonValidate(), supportsPhp84ArraySearchFunctions(), supportsRoundingModeEnum(), and supportsFpow() from raw version_compare(VERSION, '8.4.0') to advertisesBuiltinSince() so 8.4.0-dev forward profile registers implemented builtins.
• Phantom gates on Zend 8.2 reference profile remain via builtinAdvertisementVersion() returning 8.2.0 on that profile.
• Add maintainer-gap repro scripts for each regression.

php-src reference: ext/standard/basic_functions.c, ext/standard/array.c, ext/standard/string.c, ext/json/php_json.c, ext/standard/basic_functions.stub.php (RoundingMode enum).

Test plan

VM repro (all print ok):

php bin/vm.php test/repro/maintainer_gap_class_has_functions_unregistered.php
php bin/vm.php test/repro/maintainer_gap_str_increment_json_validate_unregistered.php
php bin/vm.php test/repro/maintainer_gap_php84_array_search_unregistered.php
php bin/vm.php test/repro/maintainer_gap_rounding_mode_enum_unregistered.php

AOT lint:

php bin/compile.php -l test/repro/maintainer_gap_class_has_functions_unregistered.php
php bin/compile.php -l test/repro/maintainer_gap_str_increment_json_validate_unregistered.php
php bin/compile.php -l test/repro/maintainer_gap_php84_array_search_unregistered.php
php bin/compile.php -l test/repro/maintainer_gap_rounding_mode_enum_unregistered.php

Unit gates:

./vendor/bin/phpunit --filter 'CompilerVersionBuiltinAdvertisementTest|CompilerVersionGateTest' \
  test/unit/CompilerVersionBuiltinAdvertisementTest.php test/unit/CompilerVersionGateTest.php

Compliance:

php bin/vm.php test/compliance/cases/stdlib/class_has_method.phpt
php bin/vm.php test/compliance/cases/stdlib/forward_profile_builtins.phpt

Closes #15025
Closes #15026
Closes #15027
Closes #15028

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