feat: sync shared vault at session start

.claude-plugin/marketplace.json

@@ -13,6 +13,12 @@
       "source": "./plugins/openbao-session",
       "description": "Provisions a short-lived OpenBao session token for interactive agents.",
       "version": "0.1.0"
+    },
+    {
+      "name": "shared-vault-sync",
+      "source": "./plugins/shared-vault-sync",
+      "description": "Safely pulls the shared vault at session start.",
+      "version": "0.1.0"
     }
   ]
 }