Add external plugin foundation-models (#2618)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

.github/plugin/marketplace.json

@@ -665,6 +665,35 @@
       "description": "Give your AI agent full visibility into Power Automate cloud flows via the FlowStudio MCP server. Connect, debug, build, monitor health, and govern flows at scale — action-level inputs and outputs, not just status codes.",
       "version": "2.0.0"
     },
+    {
+      "name": "foundation-models",
+      "description": "Helps coding agents write and review Apple Foundation Models code for iOS, macOS, visionOS, and watchOS using the SDK installed on the developer's Mac. It verifies real API signatures and availability, then type-checks the result instead of relying on model memory.",
+      "version": "0.1.3",
+      "author": {
+        "name": "Artem Novichkov",
+        "url": "https://github.com/artemnovichkov"
+      },
+      "repository": "https://github.com/artemnovichkov/foundation-models-plugin",
+      "homepage": "https://github.com/artemnovichkov/foundation-models-plugin",
+      "license": "MIT",
+      "keywords": [
+        "swift",
+        "ios",
+        "macos",
+        "apple",
+        "foundation-models",
+        "apple-intelligence",
+        "on-device",
+        "llm",
+        "xcode"
+      ],
+      "source": {
+        "source": "github",
+        "repo": "artemnovichkov/foundation-models-plugin",
+        "ref": "0.1.3",
+        "sha": "5837a9343db97d59107d146024b1dbd858625274"
+      }
+    },
     {
       "name": "frontend-web-dev",
       "source": "plugins/frontend-web-dev",