pub fn preview_merge_ontologies(
catalog: &OntologyCatalog,
source_paths: &[PathBuf],
target_file: &Path,
document_overrides: &HashMap<PathBuf, String>,
workspace_roots: &[PathBuf],
) -> Result<RefactorPlan>Expand description
Merge source ontology Turtle documents into target_file (prefix union + body append).