Function load_push_aliases 

pub fn load_push_aliases(cwd: &Path) -> Result<Aliases, Error>

Load the push-direction alias map (url.<base>.pushInsteadOf) for cwd. Cached separately from load_aliases. Falls back to an empty map when no pushInsteadOf entries are configured — callers should then use load_aliases for the upload path too, so plain insteadOf still applies.