dev-chatty.flan outlives the surveys' twenty seconds by design, and unlike
dev-repl it prints while it does -- so the two backends stop at different
lines and the diff reports on scheduling rather than on lowering. It joins
dev-loop and dev-watch in the excluded-by-name list in both sweeps, with the
distinction written down.
rt_flush_out is guarded on __wasm__: the pipe it is careful about belongs to a
merged flan dev, which is only ever a native host, and wasm32 need not answer
for a descriptor mode its runtime may model differently.
And three comments that went false with the _exit: the atexit registration in
the merged entry point is no longer there for rt_die, which unlinks the socket
for itself now, so both places that said so say what it is actually left
covering.