Add macOS iOS Android companion platform client wrappers

src/companion/index.ts

@@ -2,6 +2,11 @@ export {
   CompanionRuntimeClient,
   GatewayRpcError,
 } from './runtimeClient.js';
+export {
+  MacOSCompanionClient,
+  IOSCompanionClient,
+  AndroidCompanionClient,
+} from './platformClients.js';
 
 export type {
   CompanionRuntimeClientOptions,
@@ -23,3 +28,8 @@ export type {
   NodeStatus,
   NodePushSummary,
 } from './runtimeClient.js';
+export type {
+  PlatformClientOptions,
+  RegisterPushTokenInput,
+  SharedStatusInput,
+} from './platformClients.js';