Function detect_enabled_repos_from 

pub fn detect_enabled_repos_from(path: &Path) -> Vec<String>

What: Discover repositories enabled in a specific pacman configuration file.

Inputs:

• path: Path to a pacman.conf-style file.

Output:

• Repository names in declaration order; the default list (core, extra, multilib) when the file cannot be read.

Details:

• Same parsing rules as detect_enabled_repos; exists so callers and tests can target non-system configuration files.