Add changelog entry

CHANGELOG.md

@@ -2,6 +2,18 @@
 
 All changes that impact users of this module are documented in this file, in the [Common Changelog](https://common-changelog.org) format with some additional specifications defined in the CONTRIBUTING file. This codebase adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## Unreleased [major]
+
+> Development of this release was supported by the [French Ministry for Foreign Affairs](https://www.diplomatie.gouv.fr/fr/politique-etrangere-de-la-france/diplomatie-numerique/) through its ministerial [State Startups incubator](https://beta.gouv.fr/startups/open-terms-archive.html) under the aegis of the Ambassador for Digital Affairs.
+
+### Added
+
+- Expose collection metadata through the collection API; requires a [metadata file](https://docs.opentermsarchive.org/collections/metadata/) at the root of your collection folder
+
+### Changed
+
+- **Breaking:** Replace `@opentermsarchive/engine.services.declarationsPath` with `@opentermsarchive/engine.collectionPath`; ensure your declarations are located in `./declarations` in your collection folder
+
 ## 3.0.0 - 2024-12-03
 
 _Full changeset and discussions: [#1122](https://github.com/OpenTermsArchive/engine/pull/1122)._