Update changelog with unreleased changes

Author: bartTC

CHANGELOG.md

@@ -2,6 +2,20 @@
 
 All notable changes to this project will be documented in this file.
 
+## [Unreleased]
+
+### Added
+- Justfile for build and release commands (`just build-dev`, `just release`, etc.)
+- CDN detection test suite (27 test cases)
+- Akamai detection via `server` header (supports AkamaiGHost, AkamaiNetStorage)
+
+### Changed
+- Refactored CDN detection into shared `constants.js` with declarative rules
+- CDN info notes now only appear when relevant (Fastly note requires x-cache header, CloudFront note only on MISS)
+
+### Fixed
+- URL display after redirects (now shows final URL instead of intermediate redirect URLs)
+
 ## [v0.0.3] - 2026-01-04
 
 ### Fixed