release: publish plaud-mpm-plugin as a Codex marketplace

.agents/plugins/marketplace.json

@@ -0,0 +1,20 @@
+{
+  "name": "plaud-mpm-marketplace",
+  "interface": {
+    "displayName": "MPM Plaud"
+  },
+  "plugins": [
+    {
+      "name": "plaud-mpm",
+      "source": {
+        "source": "local",
+        "path": "."
+      },
+      "policy": {
+        "installation": "AVAILABLE",
+        "authentication": "ON_INSTALL"
+      },
+      "category": "Productivity"
+    }
+  ]
+}