Add canva plugin (#3387)

.claude-plugin/marketplace.json

@@ -539,6 +539,22 @@
       },
       "homepage": "https://buildkite.com"
     },
+    {
+      "name": "canva",
+      "description": "Create, edit, review, resize, and brand-check Canva designs with the Canva MCP server.",
+      "author": {
+        "name": "Canva"
+      },
+      "category": "design",
+      "source": {
+        "source": "git-subdir",
+        "url": "https://github.com/canva-sdks/canva-skills.git",
+        "path": "plugins/canva",
+        "ref": "main",
+        "sha": "b56291ea0a36d0a941e1478b47959be5f1771dee"
+      },
+      "homepage": "https://www.canva.com"
+    },
     {
       "name": "carta-cap-table",
       "description": "Carta Cap Table plugin — skills and hooks for querying cap tables, grants, SAFEs, 409A valuations, waterfall scenarios, and more",