Add math-olympiad plugin to marketplace

.claude-plugin/marketplace.json

@@ -694,6 +694,17 @@
         }
       }
     },
+    {
+      "name": "math-olympiad",
+      "description": "Solve competition math (IMO, Putnam, USAMO) with adversarial verification that catches what self-verification misses. Fresh-context verifiers attack proofs with specific failure patterns. Calibrated abstention over bluffing.",
+      "author": {
+        "name": "Anthropic",
+        "email": "support@anthropic.com"
+      },
+      "source": "./plugins/math-olympiad",
+      "category": "productivity",
+      "homepage": "https://github.com/anthropics/claude-plugins-official/tree/main/plugins/math-olympiad"
+    },
     {
       "name": "mcp-server-dev",
       "description": "Skills for designing and building MCP servers that work seamlessly with Claude. Guides you through deployment models (remote HTTP, MCPB, local), tool design patterns, auth, and interactive MCP apps.",