docs: update changelog for v1.5.17

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

CHANGELOG.md

@@ -6,6 +6,11 @@ Format follows [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 
 ## [Unreleased]
 
+## [1.5.17] - 2026-01-15
+
+### Added
+- New `/gsd:update` command — check for updates, install, and display changelog of what changed (better UX than raw `npx get-shit-done-cc`)
+
 ## [1.5.16] - 2026-01-15
 
 ### Added
@@ -743,7 +748,8 @@ Format follows [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 - YOLO mode for autonomous execution
 - Interactive mode with checkpoints
 
-[Unreleased]: https://github.com/glittercowboy/get-shit-done/compare/v1.5.16...HEAD
+[Unreleased]: https://github.com/glittercowboy/get-shit-done/compare/v1.5.17...HEAD
+[1.5.17]: https://github.com/glittercowboy/get-shit-done/releases/tag/v1.5.17
 [1.5.16]: https://github.com/glittercowboy/get-shit-done/releases/tag/v1.5.16
 [1.5.15]: https://github.com/glittercowboy/get-shit-done/releases/tag/v1.5.15
 [1.5.14]: https://github.com/glittercowboy/get-shit-done/releases/tag/v1.5.14