- bonfire.WithExitCode (additive) makes an error carry the exit code
bonfire.Execute returns; a code outside 1..255 gives 1
- runAppCmd, factored out of runAppBinary, returns
Reported(WithExitCode(err, code)) when the binary exited with a code, so
summer prints no second error block; a binary killed by a signal keeps
summer's block and exit 1
- README, console introduction and upgrading notes say so (CR-02)
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