Notably, we include the base desk last. This is to ensure that the
other desks are present by the time kiln gets loaded from base, letting
it install the software on the other desks, as per 22ad2516c.
* jb/re-mug-pre:
arvo: temporary, build +brass out of /not-sys
hoon: switches to new +mug
u3: adds new +mug (as u3r_gum_*)
hoon: adds new +mug (as +gum)
u3: updates +muk to truncate seed and removes spurious assertion
hoon: updates +muk to truncate seed and removes spurious assertion