ford: explain +load change in comment
::
$(ducts t.ducts, moves (weld moves duct-moves))
--
-:: +load: migrate old state to new state (called on vane reload)
+:: +load: flush old state (called on vane reload)
::
-:: Trim builds completely in case a change to our code invalidated an
-:: old build result.
+:: This is a temporary measure for the OS1 %publish update. We can flush all
+:: build state like this because only gall and %publish use ford live builds
+:: currently. :goad will handle remaking builds for gall, and the new
+:: %publish does not use ford.
::
++ load
|= old=axle
