fix: remove duplicate developer-growth-analysis entry from marketplace

.claude-plugin/marketplace.json

@@ -169,12 +169,6 @@
       "description": "Skills for working with Excel spreadsheets including creation, editing, formulas, and data manipulation.",
       "source": "./document-skills/xlsx",
       "category": "productivity-organization"
-    },
-    {
-      "name": "developer-growth-analysis",
-      "description": "Analyzes your recent Claude Code chat history to identify coding patterns, development gaps, and areas for improvement, curates relevant learning resources from HackerNews, and automatically sends a personalized growth report to your Slack DMs.",
-      "source": "./developer-growth-analysis",
-      "category": "development"
     }
   ]
 }