Update appcast for v1.0.0-beta.15

- Add new entry for beta.15 with build number 205
- Include Sparkle EdDSA signature for secure updates
- Add comprehensive changelog with major features:
  - Push notifications with Claude detection
  - Git worktree management and follow mode
  - CJK input support and terminal multiplexer integration
  - Quick session switching with keyboard shortcuts
- Include contributor acknowledgments

appcast-prerelease.xml

@@ -5,6 +5,75 @@
         <link>https://github.com/amantus-ai/vibetunnel</link>
         <description>VibeTunnel pre-release and beta updates feed</description>
         <language>en</language>
+        <item>
+            <title>VibeTunnel 1.0.0-beta.15</title>
+            <link>https://github.com/amantus-ai/vibetunnel/releases/download/v1.0.0-beta.15/VibeTunnel-1.0.0-beta.15.dmg</link>
+            <sparkle:version>205</sparkle:version>
+            <sparkle:shortVersionString>1.0.0-beta.15</sparkle:shortVersionString>
+            <description><![CDATA[
+                <h2>VibeTunnel 1.0.0-beta.15</h2>
+                <p><strong>Pre-release version</strong></p>
+                
+                <h3>✨ Major Features</h3>
+                <h4><strong>Push Notifications</strong> (#475)</h4>
+                <ul>
+                <li>Native push notifications for terminal events - get notified when commands complete, sessions start/end, or errors occur</li>
+                <li>Customizable notification types: Session exits, command completion (>3s), command errors, terminal bell, Claude AI turn notifications</li>
+                <li>Smart Claude detection: Automatically identifies Claude CLI sessions and tracks when Claude finishes responding</li>
+                <li>Complete overhaul of the notification system with reliable push notifications for session events</li>
+                <li>Test notification feature now works seamlessly between web frontend and Mac app</li>
+                </ul>
+                
+                <h4><strong>Git Worktree Management & Follow Mode</strong> (#452)</h4>
+                <ul>
+                <li>Full worktree support: Create, manage, and delete Git worktrees directly from VibeTunnel</li>
+                <li>VibeTunnel intelligently follows Git worktrees instead of just branches, perfect for developers using worktrees for parallel development</li>
+                <li>When you switch branches in your editor/IDE, VibeTunnel automatically switches to the corresponding worktree terminal session</li>
+                <li>The <code>vt follow</code> command works contextually - run it from either your main repository or a worktree to set up appropriate tracking</li>
+                </ul>
+                
+                <h4><strong>Comprehensive CJK Input Support</strong> (#480)</h4>
+                <ul>
+                <li>Full support for CJK input methods with proper IME (Input Method Editor) integration</li>
+                <li>Fixed input duplication issues that affected Asian language users</li>
+                <li>Improved Z-index management to ensure IME candidates display correctly above terminal content</li>
+                </ul>
+                
+                <h4><strong>Terminal Multiplexer Integration</strong> (#460)</h4>
+                <ul>
+                <li>Full integration with tmux, Zellij, and GNU Screen terminal multiplexers for persistent sessions</li>
+                <li>Create, list, and attach to tmux/Zellij/Screen sessions directly from VibeTunnel interface</li>
+                <li>Sessions persist across VibeTunnel restarts - never lose your work</li>
+                </ul>
+                
+                <h4><strong>Quick Session Switching</strong></h4>
+                <ul>
+                <li>Use Cmd+1...9 (Mac) or Ctrl+1...9 (Linux) to instantly switch between sessions when keyboard capture is active</li>
+                <li>Cmd/Ctrl+0 switches to the 10th session</li>
+                </ul>
+                
+                <h3>🐛 Bug Fixes</h3>
+                <ul>
+                <li>Enhanced VT command reliability with self-healing capabilities</li>
+                <li>Fixed menu bar icon not appearing on app launch</li>
+                <li>Enhanced Tailscale integration with automatic authentication</li>
+                <li>Improved notification system reliability</li>
+                <li>Fixed blinking cursor issue in binary terminal mode</li>
+                <li>Completely redesigned keyboard handling for iOS devices</li>
+                </ul>
+                
+                <h3>👥 Contributors</h3>
+                <p>First-time contributors: @jblwilliams, @lox, @diegopetrucci</p>
+                <p>Additional contributors: @hjanuschka, @fal3, @hewigovens</p>
+            ]]></description>
+            <pubDate>Fri, 02 Aug 2025 00:19:31 +0000</pubDate>
+            <enclosure url="https://github.com/amantus-ai/vibetunnel/releases/download/v1.0.0-beta.15/VibeTunnel-1.0.0-beta.15.dmg" 
+                       sparkle:version="205" 
+                       sparkle:shortVersionString="1.0.0-beta.15" 
+                       length="35951408" 
+                       type="application/x-apple-diskimage" 
+                       sparkle:edSignature="s56J7oqLfnvIeOHNex1AvSy5vxDMk4KD2xj0PI9HFflUdba9frhYMHpPy9XDzU/+SnNft9i6zKZ7w/XNDaV9Dw=="/>
+        </item>
         <item>
             <title>VibeTunnel 1.0.0-beta.14</title>
             <link>https://github.com/amantus-ai/vibetunnel/releases/download/v1.0.0-beta.14/VibeTunnel-1.0.0-beta.14.dmg</link>