Quote command args in setenv example

[salva]

Summary

Quote the user command and arguments in examples/setenv_and_exec.pl before building the remote shell command.

Changes

• Apply $ssh->shell_quote to every element of @ARGV.
• Preserve the existing environment export behavior.

Fixes #54.

Testing

• perl -Ilib -c examples/setenv_and_exec.pl

[Copilot]

Pull request overview

This PR updates the setenv_and_exec example to avoid command-injection pitfalls by shell-quoting the user-supplied remote command and its arguments before assembling the remote shell string, aligning the example with safer Net::OpenSSH usage (Fixes #54).

Changes:

• Apply $ssh->shell_quote to each element of @ARGV before concatenating into the remote command.
• Preserve the existing export ... environment setup behavior and overall command structure.

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