chore(upm): release 0.2.1 and run split on macos host runner

Bump package to 0.2.1 (maintenance/publish, no API changes) and repoint
the Publish UPM workflow from ubuntu-latest to the macos host runner.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Packages/com.darkmattergameproduction.fonepay-unity/CHANGELOG.md

@@ -4,6 +4,11 @@ All notable changes to this package will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
+## [0.2.1] - 2026-06-16
+
+### Changed
+- Maintenance release to publish the package via the UPM split pipeline. No API or runtime changes.
+
 ## [0.2.0] - 2026-05-07
 
 ### Changed

Packages/com.darkmattergameproduction.fonepay-unity/package.json

@@ -1,7 +1,7 @@
 {
   "name": "com.darkmattergameproduction.fonepay-unity",
   "displayName": "Fonepay Unity",
-  "version": "0.2.0",
+  "version": "0.2.1",
   "unity": "6000.4",
   "unityRelease": "5f1",
   "description": "Fonepay payment integration for Unity. Generate Fonepay QR codes, await payment confirmation via websocket, and process tax refunds. Credentials managed via Tools > Fonepay > Settings.",