Fix release workflow to strip 'v' prefix from version tag

NuGet version strings don't support the 'v' prefix. The workflow
extracts the git tag (e.g., v1.0.0-beta.13) and strips the 'v' to get
the proper NuGet version format (1.0.0-beta.13).

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Author: StevenTCramer

.github/workflows/release.yml

@@ -20,7 +20,10 @@ jobs:
         dotnet-quality: 'preview'
 
     - name: Extract version from tag
-      run: echo "VERSION=${GITHUB_REF#refs/tags/}" >> $GITHUB_ENV
+      run: |
+        VERSION=${GITHUB_REF#refs/tags/}
+        VERSION=${VERSION#v}
+        echo "VERSION=$VERSION" >> $GITHUB_ENV
 
     - name: Restore dependencies
       run: dotnet restore