Add gc-ai plugin

.claude-plugin/marketplace.json

@@ -1591,6 +1591,21 @@
       },
       "homepage": "https://www.fullstory.com"
     },
+    {
+      "name": "gc-ai",
+      "displayName": "GC AI",
+      "description": "Work in your GC AI legal knowledge base from Claude: upload documents, run review playbooks, and ask questions grounded in your own files, all as you.",
+      "author": {
+        "name": "GC AI"
+      },
+      "category": "productivity",
+      "source": {
+        "source": "url",
+        "url": "https://github.com/GC-AI-Inc/gc-ai-claude-plugin.git",
+        "sha": "efda779972c7b7162e79234e164bc2f359a8a518"
+      },
+      "homepage": "https://docs.gc.ai/api-reference/mcp/overview"
+    },
     {
       "name": "github",
       "description": "Official GitHub MCP server for repository management. Create issues, manage pull requests, review code, search repositories, and interact with GitHub's full API directly from Claude Code.",