fix: restore word_cloud entrypoint pointing to xblocks_contrib

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: 2 people

pyproject.toml

@@ -46,6 +46,7 @@ vertical = "xmodule.vertical_block:VerticalBlock"
 video = "xmodule.video_block:VideoBlock"
 videoalpha = "xmodule.video_block:VideoBlock"
 videodev = "xmodule.template_block:TranslateCustomTagBlock"
+word_cloud = "xblocks_contrib:WordCloudBlock"
 wrapper = "xmodule.wrapper_block:WrapperBlock"
 
 [project.entry-points."xblock_asides.v1"]