sys.startApp(path, args) tears the runtime down and starts over from a
file, and keeps nothing else: no history, no title, no app identity. All
of that can ride in the arguments, so it does, and sdcard/.lua/lib/nav.lua
is the single writer of that table.
nav owns the back stack, the bar's title and /.lua/data/<AppId>, which
means the launcher, what "back" reaches and how deep a route nests are
editable on the card rather than in a reflash. Apps call nav.launch,
nav.replace and nav.back; sys.startApp has one caller.
Boot passes no arguments at all, which is how main.lua tells a cold start
from a navigation and opens its own launcher, replacing the home field the
runtime used to read. Arguments cross as JSON, so history is a list of
tables rather than a packed string, and an app passing something JSON
cannot carry sees the error at its own nav call.
evan
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