Source seems to be here:
or here:
https://gitlab.labs.nic.cz/turris/pakon-light
Part of me wishes Turris would stick to github or gitlab and/or keep the READMEs clean enough to immediately identify the role of each. But it looks like gitlab hosts the pakon source code and github the package management for it. Shining light onto my naive researches is always welcome.
As time permits I’ll try and work out how it works, it seems not too complex and python based which lends me confidence.