Function routeServiceMessage

routeServiceMessage(
    windowId: string,
    message: NappletMessage,
    services: ServiceRegistry,
    sendToNapplet: SendToNapplet,
): boolean
Route a NappletMessage envelope to the matching service handler.

Direct NAP-domain services are routed by the domain in their wire message.type (e.g., 'signer.signEvent' -> 'signer' service). INC messages are owned by the INC runtime; their topic values are opaque here.

Returns true if a service handled the message, false otherwise.
Parameters
- windowId: string
  The napplet window that sent the message
- message: NappletMessage
  The NappletMessage envelope to route
- services: ServiceRegistry
  The service registry to look up handlers
- sendToNapplet: SendToNapplet
  Callback to send messages back to the napplet
Returns boolean
true if a service handled the message, false if no matching service
Example
```
const handled = routeServiceMessage(windowId, msg, services, sendToNapplet);
if (!handled) { // fallback handling }
```
- Defined in packages/runtime/src/service-dispatch.ts:26