update changelog

CHANGELOG.md

@@ -2,6 +2,24 @@
 
 All notable changes to this project will be documented in this file.
 
+## v0.4.0 - 2026-01-18
+### Added
+- CLI tool (`cmd/`) for quick device queries using cobra
+  - `get device <name>` - fetch info from a single device
+  - `get devices` - fetch info from all configured devices in parallel
+  - YAML/JSON config file support with environment variable overlay
+  - Pretty print and colorized YAML output options
+- `Login(ctx, host)` method to both toughswitch and edgeos clients for explicit pre-authentication
+- Context helpers for storing/retrieving clients (`ToughSwitchClientFromContext`, `EdgeOSClientFromContext`)
+
+### Changed
+- CLI uses zerolog's built-in context methods for logger storage
+- CLI prerun creates shared clients from config and stores in context
+- Updated documentation (README.md, CLAUDE.md) with CLI usage and new Login method
+
+### Fixed
+- Config default flag handling in CLI
+
 ## v0.3.0 - 2026-01-14
 ### Changed
 - Renamed project from toughswitch to ubiquiti-clients