fix: use --prerelease flag instead of --latest for library docs releases

Change the release creation to use --prerelease flag since these are
pre-built artifacts meant for caching, not user-facing releases that
should be marked as latest.

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: milldr

.github/workflows/generate-library.yml

@@ -224,7 +224,7 @@ jobs:
           gh release create "library-docs-${VERSION}" \
             --title "Library Docs ${VERSION}" \
             --notes "Pre-built library documentation for fast preview builds. Generated $(date -u +'%Y-%m-%d %H:%M:%S UTC')." \
-            --latest \
+            --prerelease \
             library-docs.tar.gz
 
       - name: Cleanup Old Releases