refactor: Introduce build aggregator (#814)

* refactor: Introduce build aggregator

* refined comment

* linting

* Update rust/operator-binary/src/controller/build/mod.rs

Co-authored-by: maltesander <malte.sander.it@gmail.com>

* revert test change and refine comment

* changelog

---------

Co-authored-by: maltesander <malte.sander.it@gmail.com>
Co-authored-by: Siegfried Weber <mail@siegfriedweber.net>

Author: 3 people

CHANGELOG.md

@@ -2,6 +2,13 @@
 
 ## [Unreleased]
 
+### Changed
+
+- Internal operator refactoring: introduce a build() step in the reconciler that
+  assembles all relevant Kubernetes resources before anything is applied ([#814]).
+
+[#814]: https://github.com/stackabletech/airflow-operator/pull/814
+
 ## [26.7.0] - 2026-07-21
 
 ## [26.7.0-rc1] - 2026-07-16