Merge pull request #607 from phparkitect/perf/isphpcoreclass-cache

perf: add trait_exists and enum_exists to early-exit guard in checkIsPhpCoreClass

style: move cache property declaration with other class properties

perf: cache ReflectionClass calls in isPhpCoreClass

Merge pull request #605 from phparkitect/dependabot/github_actions/codecov/codecov-action-6

ci(deps): bump codecov/codecov-action from 5 to 6

Merge pull request #601 from phparkitect/claude/add-phar-mandatory-option-4tDuL

Merge pull request #602 from phparkitect/claude/add-php-scoper-phar-J56O3

Merge pull request #604 from phparkitect/claude/fix-test-variable-name-DhYHM

fix: rename misleading \$isFinal variable to \$isTrait in IsTraitTest

Remove box.json settings that match default values

Exclude Composer namespace from scoping

Use _PhpArkitect prefix to avoid confusion with project namespace

Add php-scoper to phar build to prevent namespace conflicts

Fix CS: use Yoda-style comparison in isRunningAsPhar