FWIW, both Mononoke (the server) and EdenFS (the virtual filesystem) are now "usable, but undocumented & unsupported" in the open-source repo as of the past ~3

FWIW, both Mononoke (the server) and EdenFS (the virtual filesystem) are now "usable, but undocumented & unsupported" in the open-source repo as of the past ~3 months, and there are published binary artifacts created on each commit if you go look through the workflows. So, if you're adventurous, you can try using them now. That said, it's probably still a year out or so from actually being usable and documented.