Implement app update orchestration (T-402)

app-win7/platform/windows/platform_stub.go

@@ -3,7 +3,9 @@
 package windows
 
 import (
+	"context"
 	"runtime"
+	"time"
 
 	"softbox.local/core/application/launch"
 )
@@ -30,6 +32,10 @@ func (platformStub) IsRunning(string, string) (bool, error) {
 	return false, ErrUnsupported
 }
 
+func (platformStub) WaitForExit(context.Context, string, string, time.Duration) error {
+	return ErrUnsupported
+}
+
 func (platformStub) Start(launch.Command) (int, error) {
 	return 0, ErrUnsupported
 }