Function validate_args 

pub fn validate_args(args: &CliArgs) -> Result<(), CliError>

Validate CLI arguments for consistency and completeness.

This function performs comprehensive validation of all CLI arguments, checking for:

• Required arguments in certain modes
• Conflicting argument combinations
• Valid argument values

Errors

Returns a structured CliError with helpful messages if validation fails.

Example

let args = parse_args()?;
validate_args(&args)?;  // Will error if args are invalid