docs(changelog): add entry for stricter Python namespace name validation

docs/CHANGELOG.md

@@ -8,6 +8,10 @@
 - Internal namespace name error which occured when generating Python documentation with `.` as the project directory
 - Ignore Python namespaces with invalid names during documentation generation
 
+### Changed
+
+- Stricter Python namespace name validation
+
 ## [0.2.0] - 2026-09-28
 
 ### Added