Update appcast for 0.16.6 (release)

Author: github-actions[bot]

docs/appcast.xml

@@ -2,6 +2,34 @@
 <rss version="2.0" xmlns:sparkle="http://www.andymatuschak.org/xml-namespaces/sparkle" xmlns:dc="http://purl.org/dc/elements/1.1/">
   <channel>
     <title>Osaurus</title>
+        <item>
+            <title>0.16.6</title>
+            <pubDate>Wed, 08 Apr 2026 11:21:13 +0000</pubDate>
+            <sparkle:channel>release</sparkle:channel>
+            <sparkle:version>0.16.6</sparkle:version>
+            <sparkle:shortVersionString>0.16.6</sparkle:shortVersionString>
+            <sparkle:minimumSystemVersion>15.0</sparkle:minimumSystemVersion>
+            <sparkle:hardwareRequirements>arm64</sparkle:hardwareRequirements>
+            <enclosure url="https://github.com/osaurus-ai/osaurus/releases/download/0.16.6/Osaurus-0.16.6.dmg" length="32874778" type="application/octet-stream" sparkle:edSignature="3IKx4ZXQVR30qY4S1yP6PuPhG1guYTUgShouaaYpievIE6N8+Dse72JqRRmlM+e3FsDUcKA4Qc4KEi0cqNAvBQ=="/>
+            <description sparkle:format="markdown"><![CDATA[
+## What's Changed
+
+## 🚀 Features
+
+- added turboquant configuration (#810) by @tpae
+
+## 🐛 Bug Fixes
+
+- fixed background image for work view (#811) by @tpae
+
+## 🧰 Maintenance
+
+- context management cleanup (#807) by @tpae
+- chore: bump mlx-swift-lm to 7d9a6ab (#809) by @jjang-ai
+
+**Full Changelog**: https://github.com/osaurus-ai/osaurus/compare/0.16.5...0.16.6
+]]></description>
+        </item>
         <item>
             <title>0.16.5</title>
             <pubDate>Tue, 07 Apr 2026 13:39:50 +0000</pubDate>