Update to imessage

{
  "official": [
    {
      "name": "imessage",
      "source": "./external_plugins/imessage",
      "category": "productivity",
      "description": "iMessage messaging bridge with built-in access control. Reads chat.db directly, sends via AppleScript. Manage pairing, allowlists, and policy via /imessage:access."
    }
  ]
}