docs: update changelog for v1.12.0

CHANGELOG.md

@@ -6,6 +6,17 @@ Format follows [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 
 ## [Unreleased]
 
+## [1.12.0] - 2026-02-07
+
+### Changed
+- **Architecture: Thin orchestrator pattern** — Commands now delegate to workflows, reducing command file size by ~75% and improving maintainability
+- **Centralized utilities** — New `gsd-tools.js` (11 functions) replaces repetitive bash patterns across 50+ files
+- **Token reduction** — ~22k characters removed from affected command/workflow/agent files
+- **Condensed agent prompts** — Same behavior with fewer words (executor, planner, verifier, researcher agents)
+
+### Added
+- `gsd-tools.js` CLI utility with functions: state load/update, resolve-model, find-phase, commit, verify-summary, generate-slug, current-timestamp, list-todos, verify-path-exists, config-ensure-section
+
 ## [1.11.2] - 2026-02-05
 
 ### Added
@@ -1103,7 +1114,8 @@ 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/v1.11.2...HEAD
+[Unreleased]: https://github.com/glittercowboy/get-shit-done/compare/v1.12.0...HEAD
+[1.12.0]: https://github.com/glittercowboy/get-shit-done/releases/tag/v1.12.0
 [1.11.2]: https://github.com/glittercowboy/get-shit-done/releases/tag/v1.11.2
 [1.11.1]: https://github.com/glittercowboy/get-shit-done/releases/tag/v1.11.0
 [1.10.1]: https://github.com/glittercowboy/get-shit-done/releases/tag/v1.10.1