Only output belongs on stdout; status and prompts belong on stderr #13
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Per POSIX specifications re: use of each stream. See https://unix.stackexchange.com/questions/331611/do-progress-reports-logging-information-belong-on-stderr-or-stdout for full discussion.
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Per POSIX specifications re: use of each stream. See Do progress reports logging information belong on stderr or stdout?
for discussion. (Note also that shell prompts -- in bash, POSIX sh, or others -- are conventionally on stderr).
This also disables color highlighting when not writing to a TTY. In the future, we should probably also prevent prompts from being written at all when stdout is redirected to a FIFO/filo/etc.