Adopt PHP 8.3 typed class constants and #[\Override] across src/

[lisachenko]

Summary

From the PHP 8.5 support audit (PR #597); user-approved modernization batch.

Typed class constants (8.3)

Exactly one constant in src/ is typed (AbstractMethodInvocation::TRAIT_ALIAS_PREFIX). Add native types to the rest — concentrated targets:

• src/Core/AspectContainer.php:27-67 (9 string constants)
• src/Aop/Features.php:24-54 (int constants; see also the dead-flag cleanup in Process/cleanup: dead PARAMETER_WIDENING flag, orphaned test fixtures, lost golden coverage, PHPStan on 8.5 in CI #610)
• src/Aop/Pointcut.php:45-53 (9 int KIND_* constants)
• src/Proxy/Generator/MethodGenerator.php:37-39, src/Proxy/Generator/ClassGenerator.php:37-39, src/Proxy/Generator/PropertyGenerator.php:27-34 (FLAG_*)
• src/Proxy/Generator/TypeGenerator.php:41 (BUILTIN_TYPES → const array), src/Proxy/EnumProxyGenerator.php:56,66
• src/Instrument/ClassLoading/CachePathManager.php:32,37, src/Instrument/Transformer/WeavingTransformer.php:42

#[\Override] (8.3)

Zero occurrences in src/ despite deep hierarchies. Add it to overriding methods in framework code — transformers implementing transform(), SourceTransformingLoader::filter() (overrides php_user_filter), the AbstractJoinpoint/AbstractInvocation/AbstractInterceptor hierarchies, Pointcut::matches() implementations — and replace bare @inheritDoc docblocks where the attribute is the enforced version.

Caveat: never add #[\Override] to test-project fixture classes that get woven — the weaver strips it from intercepted methods for trait-alias reasons (stripOverrideAttributeFromInterceptedMethods()), and fixtures are meant to exercise that path deliberately, not accidentally.

[lisachenko]

Scope update from PR #617 review: the maintainer declined the blanket #[\Override] adoption (churn without runtime benefit), so that half of this issue is intentionally dropped. The typed-class-constants half is implemented in #617, which will close this issue on the constants alone.

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