release: v0.9.1 - fix API 404 routing issue

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

Author: Ubuntu

CHANGELOG.md

@@ -7,6 +7,14 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.9.1] - 2026-01-16
+
+### Fixed
+- API routes returning 404 due to Go version mismatch
+  - Code uses Go 1.22+ ServeMux method-prefixed patterns (e.g., `"GET /health"`)
+  - Updated `go.mod` from `go 1.21` to `go 1.22` to enable new routing behavior
+  - Without this fix, all API endpoints fail when built with Go 1.22+
+
 ## [0.9.0] - 2026-01-16
 
 ### Added