Progress-sender is a trivial component that demonstrates how a core based component can display a minimal UI while the system is running non-interactive processes.
This is meant as an example which other components can be based on.
To add this component to your build, append --with-base src/recovery/examples/progress-sender to the fx set invocation.
Use ffx component run to launch this component into a restricted realm for development purposes:
$ ffx component run /core/ffx-laboratory:progress-sender fuchsia-pkg://fuchsia.com/progress-sender#meta/progress-sender.cm