Fix marketplace URL format in code review workflow

The claude-code-action requires full HTTPS Git URLs ending in .git
for marketplace configuration.

Author: ghostwriternr

.github/workflows/claude-code-review.yml

@@ -34,7 +34,7 @@ jobs:
         with:
           anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}
           plugin_marketplaces: |
-            obra/superpowers-marketplace
+            https://github.com/obra/superpowers-marketplace.git
           plugins: |
             superpowers@superpowers-marketplace
           prompt: |