NOTE
Spring AOP Source: Creating the Auto-Proxy Creator
Lifecycle of Spring's AOP auto-proxy creator as an infrastructure bean and BeanPostProcessor.
This is a historical learning note and may contain outdated or incomplete understanding.
The auto-proxy creator is itself created as Spring infrastructure early enough to participate in later bean creation.
As a bean post-processor, it is registered before ordinary singleton instantiation completes. This ordering matters: if infrastructure that creates proxies were registered too late, earlier beans could miss wrapping.
Source-level class names/order are version-specific. Follow the current refresh()/post-processor registration path for the Spring version under study.