Function validate_package_names 

pub fn validate_package_names<S: AsRef<str>>(
    names: &[S],
    context: &str,
) -> Result<()>

What: Validate a list of package names against the strict install-command allowlist.

Inputs:

• names: Package names that will be placed into commands.
• context: Human-readable operation context for actionable error messages.

Output:

• Ok(()) when all names are valid.
• Err(ArchToolkitError::InvalidPackageName) naming the first invalid package.

Details:

• Centralises validation so all install builders apply the same safety policy.
• The reported pattern states the leading-byte restriction that prevents option confusion.
• Ported from Pacsea’s install/utils.rs, adapted to ArchToolkitError.

Errors

Returns ArchToolkitError::InvalidPackageName for the first name that fails is_safe_package_name().