Add mercadopago plugin (#1813)

Mercado Pago full-product integration toolkit — 13 skills, agents, and a
bundled MCP for live API data. Sourced from
mercadopago/mercadopago-claude-marketplace at plugins/mercadopago, pinned
to 1de8d97e.

Closes #1272

https://claude.ai/code/session_01XCupEyAPLqxo2eHgVoWevi

Co-authored-by: Claude <noreply@anthropic.com>

.claude-plugin/marketplace.json

@@ -1168,6 +1168,22 @@
       "category": "development",
       "homepage": "https://github.com/anthropics/claude-plugins-official/tree/main/plugins/mcp-server-dev"
     },
+    {
+      "name": "mercadopago",
+      "description": "Mercado Pago full-product integration toolkit. Covers online checkout (Pro, Bricks, API), in-store (QR, Point), subscriptions, marketplace, wallet, money-out, security (3DS, PCI), reporting, SDKs, and specialized integrations. Hybrid architecture: 13 skills provide stable integration intelligence, MCP provides live API data.",
+      "author": {
+        "name": "Mercado Pago Developer Experience"
+      },
+      "category": "development",
+      "source": {
+        "source": "git-subdir",
+        "url": "https://github.com/mercadopago/mercadopago-claude-marketplace.git",
+        "path": "plugins/mercadopago",
+        "ref": "main",
+        "sha": "1de8d97e1c875136e93bc8eea8494ebf982a08b8"
+      },
+      "homepage": "https://github.com/mercadopago/mercadopago-claude-marketplace/tree/main/plugins/mercadopago"
+    },
     {
       "name": "microsoft-docs",
       "description": "Access official Microsoft documentation, API references, and code samples for Azure, .NET, Windows, and more.",