[gr8man]

Description
In FrankenPHP Worker Mode, Factories::reset() was executed after every request, destroying all shared instances including Config\* objects (Config\App, Config\Database, Config\Security, etc.). This forced each subsequent request in the worker lifecycle to rediscover, re-instantiate, and re-parse environment variables for stateless configuration classes.

This PR introduces selective factory retention:

• Added Factories::resetExcept(array $components): void to selectively reset factories while preserving specified components.
• Added Factories::resetForWorkerMode(?WorkerMode $config = null): void to reset factories between requests while retaining persistent components configured in $persistentFactories.
• Added $persistentFactories property to Config\WorkerMode (defaulting to ['config']).
• Updated frankenphp-worker.php.tpl to call Factories::resetForWorkerMode($workerConfig).
• Updated Worker Mode documentation, upgrading guide, and changelog.

Checklist:

• Securely signed commits
• Component(s) with PHPDoc blocks, only if necessary or adds value (without duplication)
• Unit testing, with >80% coverage
• User guide updated
• Conforms to style guide

[michalsn]

This can leak configuration between requests. Config properties are mutable, and Registrars may return request-specific values. In Worker Mode, a later request could receive a config instance initialized for a previous client, without running its Registrar again. Our existing warning against Config Caching in Worker Mode reflects this risk. File Locator Caching is also disabled because of stale data concerns.

[gr8man]

Thank you for pointing this out. You are completely right — I overlooked that Config instances in CI4 do not enforce immutability and that third-party Registrars can be request-dependent. Given the existing warning against Config Caching in Worker Mode and the risk of cross-request state leakage, keeping Config instances persistent across requests is indeed unsafe for the framework.

I am closing this PR. Thank you for the thorough review and explanation!