Function validation_commands 

pub fn validation_commands() -> Vec<&'static str>

What: Build shell commands for validating doas policy configuration.

Inputs: None.

Output:

• Validation command list (doas -C, optional non-interactive probe).

Details:

• doas -C /etc/doas.conf validates syntax and rule matching.
• doas -n true is a non-interactive capability probe and may fail when nopass is not configured.