schnorr/starvz ? reverse-engineered prompt

Build me an R package called starvz that helps me analyze StarPU runtime traces and turn them into clear visual reports.

I want to point it at a folder with FxT trace files, run the workflow, and get a nice summary plot as a PNG. It should also let me load the data in R, inspect it, and create a ggplot object that I can save or customize. If possible, include the helper scripts or commands needed to go from raw trace files to the final visualization, and make it easy to run from the command line or from inside R.

Please make it feel like a practical tool for performance analysis on task based HPC applications, with support for the common workflow mentioned in the docs. If you need to check current package or plotting docs online, go ahead.