Prepare 2.1.0 release

CHANGELOG.md

@@ -8,13 +8,53 @@ The format follows [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 
 ### Added
 
-- Add an idempotent `make bootstrap` command for primary checkouts and Git
-  worktrees.
+### Changed
+
+### Fixed
+
+### Removed
+
+### Security
+
+## [2.1.0] - 2026-08-23
+
+### Added
+
+- Add a development container for a consistent, ready-to-use environment
+  ([#267]).
+- Add repository quality checks, including manifest validation, dependency
+  checks, workflow auditing, and OpenSSF Scorecard scanning ([#268], [#269],
+  [#270]).
+- Add an environment file template and an idempotent `make bootstrap` command
+  that safely prepares primary checkouts and Git worktrees ([#271], [#273]).
 
 ### Changed
 
+- Replace PyPI API tokens with trusted publishing and update GitHub Actions to
+  supported versions ([#261], [#262]).
+- Expand Ruff and ty checks, streamline pre-commit hooks, and improve the
+  default pytest configuration ([#263], [#264], [#265], [#266]).
+- Document the required checks and approvals for post-merge GitHub releases
+  ([#272]).
+
 ### Fixed
 
 ### Removed
 
 ### Security
+
+[Unreleased]: https://github.com/palewire/python-open-source-template/compare/2.1.0...HEAD
+[2.1.0]: https://github.com/palewire/python-open-source-template/compare/2.0.0...2.1.0
+[#261]: https://github.com/palewire/python-open-source-template/pull/261
+[#262]: https://github.com/palewire/python-open-source-template/pull/262
+[#263]: https://github.com/palewire/python-open-source-template/pull/263
+[#264]: https://github.com/palewire/python-open-source-template/pull/264
+[#265]: https://github.com/palewire/python-open-source-template/pull/265
+[#266]: https://github.com/palewire/python-open-source-template/pull/266
+[#267]: https://github.com/palewire/python-open-source-template/pull/267
+[#268]: https://github.com/palewire/python-open-source-template/pull/268
+[#269]: https://github.com/palewire/python-open-source-template/pull/269
+[#270]: https://github.com/palewire/python-open-source-template/pull/270
+[#271]: https://github.com/palewire/python-open-source-template/pull/271
+[#272]: https://github.com/palewire/python-open-source-template/pull/272
+[#273]: https://github.com/palewire/python-open-source-template/pull/273