Add vanta listing for VantaInc/vanta-mcp-plugin (#2236)

Adds an additional marketplace entry named `vanta` pointing to the same
source as the existing `vanta-mcp-plugin` entry (VantaInc/vanta-mcp-plugin
at the pinned SHA `345d86b5`). No code change — same upstream the existing
entry already uses; this exposes the plugin under the developer's canonical
plugin name (`vanta`, per the repo's plugin.json) alongside the existing slug.

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.claude-plugin/marketplace.json

@@ -2651,6 +2651,20 @@
       },
       "homepage": "https://github.com/UI5/plugins-coding-agents"
     },
+    {
+      "name": "vanta",
+      "description": "The Vanta plugin connects Claude Code to Vanta's security and compliance platform through the Vanta MCP server. It combines Vanta's test-specific remediation intelligence with your local repository context to help you fix compliance failures faster.",
+      "author": {
+        "name": "Vanta"
+      },
+      "category": "security",
+      "source": {
+        "source": "url",
+        "url": "https://github.com/VantaInc/vanta-mcp-plugin.git",
+        "sha": "345d86b55faa649e955b7ea5569cf52d8425c2d5"
+      },
+      "homepage": "https://help.vanta.com/en/articles/14094979-connecting-to-vanta-mcp#h_887ce3f337"
+    },
     {
       "name": "vanta-mcp-plugin",
       "description": "The Vanta plugin connects Claude Code to Vanta's security and compliance platform through the Vanta MCP server. It combines Vanta's test-specific remediation intelligence with your local repository context to help you fix compliance failures faster.",