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`secret generate mnemonic`, `secret vault list` and `secret unlocker list`, in text and `--json` form, printed through cobra's `cmd.Println` and `cmd.Printf`. Those write to stderr when no output writer is set, and the binary sets none, so a pipe or `$(...)` got nothing. They now write to `cmd.OutOrStdout()`, as `secret list` does, and so does "No versions found" from `secret version list`. Status messages and the warning printed after the mnemonic stay on stderr. A new test runs the built binary and reads the stdout of `generate mnemonic` and of both listings in both forms. Model: opus-5-5