fix: enable changelog updates for semantic release

Author: Nick MacCarthy

.releaserc.toml

@@ -12,6 +12,7 @@ prerelease_token = "rc"
 
 [semantic_release.changelog]
 mode = "update"
+insertion_flag = "<!-- version list -->"
 
 [semantic_release.changelog.default_templates]
 changelog_file = "CHANGELOG.md"

CHANGELOG.md

@@ -5,7 +5,9 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [Unreleased]
+<!-- version list -->
+
+## [3.1.0] - 2026-04-13
 ### changed
 - Modernized packaging and developer workflow around `pyproject.toml`, `uv`, `pytest`, `ruff`, and `mypy`
 - Updated CI and release automation to use the new build and verification flow