pub fn graphite_trunk(repo: &Repository) -> Option<String>Expand description
Return the first trunk branch name from .graphite_repo_config, or None if
the file is missing, unparseable, or contains no trunk entries.
Use this when you need to pass --parent <trunk> to gt track and want to
avoid hardcoding "main". Returns None rather than a hardcoded fallback so
callers can omit --parent entirely and let gt infer when the trunk is unknown.