release 0.2.2 (#176)

* add the forgotten release notes

* set the release date

* adjust the version

* reword a changelog entry

* [skip-ci]

Author: keewis

docs/changelog.md

@@ -1,16 +1,18 @@
 # Changelog
 
-## 0.3.0 (_unreleased_)
+## 0.2.2 (2025-09-15)
 
 ### New features
 
-### Breaking changes
+- Compute parent and child cell ids ({pull}`62`)
 
 ### Bug fixes
 
 - make sure arrays passed to `arro3` are C contiguous ({pull}`168`)
 
-### Documentation
+## Internals
+
+- migrate to `pixi` and `hatchling` ({pull}`167`)
 
 ## 0.2.1 (2025-08-05)