Dev: Plan 9 / 9front install & update platforms (manual vs automatic)

Plan 9 and its active fork 9front have no binary package manager — the system is a source tree you pull and rebuild. Original Plan 9 used replica/pull with fossil/venti for the archival filesystem; 9front replaced replica with git9, so the sysupdate script runs git/pull from the 9front repo and you mk install from /sys/src. Manual and source-based; no auto-update.

Mechanism	Manual	Automatic	Auto/Internet mechanism	Maintainer	URL	License
9front git9 / `sysupdate`	✓	—	`git/pull` from `gits://git.9front.org` over the network, then recompile from source	9front community	http://9front.org	MIT / LPL
Plan 9 `replica/pull`	✓	—	Network replica of the source tree	Plan 9 Foundation	http://p9f.org	MIT
fossil / venti	n/a	n/a	Archival filesystem + snapshots (storage, not an update tool)	9front / Plan 9	http://9front.org	MIT / LPL

WeKan / Electron applicability

No — Node.js/Electron are not ported; the WeKan desktop cannot run.