sys.launch(path, arg) carries a string to the next app's init(arg), nil when there is
none. States share no memory, so one string is the whole handoff; anything structured
travels as a Lua literal the receiver loads. This is what a screen split across apps
needs to say "collect a password for this network".
sys.setAppName() retitles the status bar, defaulting to the directory name as before. A
setter rather than a declared constant, so one app can retitle per screen. The bar needs
no new invalidation path for it -- the name joins rotation and theme in the cache key --
and clips a name wide enough to reach the memory slot.
evan
021b94fca2