Function read_main_pacman_conf_text 

pub fn read_main_pacman_conf_text(path: &Path) -> Result<String, String>

What: Read main pacman.conf for planning (production convenience).

Inputs:

• path: Usually DEFAULT_MAIN_PACMAN_PATH.

Output:

• File text or an IO error message.

Details:

• Callers may inject fixture text in tests instead.

Errors

• When path cannot be read (permission, missing file, I/O error); message includes the path.