feat: overwrite git attrs with dirty status

CHANGELOG.md

@@ -2,6 +2,17 @@
 
 All notable changes to this project will be documented in this file.
 
+## Unreleased
+
+### Notable changes
+
+* `attrs.disk_file_created_year`, `attrs.git_file_created_year`, and `attrs.git_file_modified_year` are now integers instead of strings. Most use cases should not be affected.
+* `attrs.git_file_created_year` is now set even if the file is not tracked by Git. In this case, it will be set to the current year (as if it were committed now).
+* `attrs.git_file_modified_year` is now overwritten if the file is modified but not committed by Git. In this case, it will be set to the current year (as if it were committed now).
+* `attrs.disk_file_created_year` is then soft-deprecated. It will still be set, but it is recommended to use `attrs.git_file_created_year` and `attrs.git_file_modified_year` directly instead.
+
+The semantic changes above are breaking, but they should not affect most users and should always be what you want.
+
 ## [6.3.0] 2025-10-09
 
 ### New features