bug: run() helper in main.go silently ignores command errors

[jpleva91]

Bug: Errors from exec.Command.Run() are silently dropped

File: cmd/shellforge/main.go

The run() helper used throughout cmdSetup() discards the error from cmd.Run():

func run(name string, args ...string) {
    cmd := exec.Command(name, args...)
    cmd.Stdout = os.Stdout
    cmd.Stderr = os.Stderr
    cmd.Run()  // return value discarded
}

Called for every setup step: brew install ollama, ollama pull $model, etc. If any of these fail (network down, brew not installed, disk full) the setup wizard silently continues and reports success.

Fix

func run(name string, args ...string) {
    cmd := exec.Command(name, args...)
    cmd.Stdout = os.Stdout
    cmd.Stderr = os.Stderr
    if err := cmd.Run(); err != nil {
        fmt.Fprintf(os.Stderr, "[shellforge] command failed: %s %v: %v\n", name, args, err)
    }
}

Or propagate the error to callers and let cmdSetup() decide whether to abort or warn.