fix: updates.xml missing stable entry — add both stable and dev channels

The pre-release workflow overwrites updates.xml with only the dev entry,
removing the stable channel. Joomla updater on sites set to stable channel
cannot see any updates.

Authored-by: Moko Consulting
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

updates.xml

@@ -1,7 +1,7 @@
 <?xml version='1.0' encoding='UTF-8'?>
 <!-- Copyright (C) 2026 Moko Consulting <hello@mokoconsulting.tech>
  SPDX-License-Identifier: GPL-3.0-or-later
- VERSION: 02.01.44-dev
+ VERSION: 02.02.00
  -->
 
 <updates>
@@ -10,6 +10,23 @@
     <description>System - MokoWaaS update</description>
     <element>mokowaas</element>
     <type>plugin</type>
+    <version>02.02.00</version>
+    <client>site</client>
+    <folder>system</folder>
+    <tags><tag>stable</tag></tags>
+    <infourl title="System - MokoWaaS">https://git.mokoconsulting.tech/MokoConsulting/MokoWaaS/releases/tag/v02</infourl>
+    <downloads>
+      <downloadurl type="full" format="zip">https://git.mokoconsulting.tech/MokoConsulting/MokoWaaS/releases/download/v02/plg_system_mokowaas-02.02.00.zip</downloadurl>
+    </downloads>
+    <targetplatform name="joomla" version="((5.[0-9])|(6.[0-9]))" />
+    <maintainer>Moko Consulting</maintainer>
+    <maintainerurl>https://mokoconsulting.tech</maintainerurl>
+  </update>
+  <update>
+    <name>System - MokoWaaS</name>
+    <description>System - MokoWaaS update (development)</description>
+    <element>mokowaas</element>
+    <type>plugin</type>
     <version>02.01.44-dev</version>
     <client>site</client>
     <folder>system</folder>