Function resolve_directory 

pub fn resolve_directory(
    config: &Config,
    install_root: &Path,
    alias: &str,
) -> Result<PathBuf, BundleDirectoryError>

Resolve the on-disk directory for a configured bundle, applying the default when [skill-bundles.<alias>].directory is unset or empty. Absolute paths configured by the user pass through verbatim; relative paths are resolved against the install root.