Prepare the next release notes

CHANGELOG.md

@@ -6,6 +6,16 @@ semantic versioning.
 
 ## [Unreleased]
 
+### Changed
+
+- The contributor workflow follows solprop's. `CONTRIBUTING.md` and the issue forms set
+  the standard for issues, labels and pull requests. A notable change now adds a
+  `changelog.d/` fragment instead of editing this file, and a rolling draft PR collects
+  the fragments after each merge. `poe check` also runs `codespell` and validates the
+  fragments. A new test keeps the version records in step, and `.zenodo.json` no longer
+  names a stale version. The workflows' actions are pinned by commit, and the release
+  checklist they refer to now exists in the Developer's guide.
+
 ## [0.3.1] - 2026-10-20
 
 ### Changed