Sidecar metadata filenames this plugin wants read out of the archive it's currently processing (basename suffixes, e.g. "ComicInfo.xml", "info.json") — lanrurugi- plugin-converter populates this automatically from every is_file_in_archive(...) call it finds in a converted plugin's source. The host resolves each name against the current archive before calling execMetadata and hands back whatever it found as MetadataHostArgs.sidecar_files: file content, never a path — this plugin itself never gets real filesystem access for this (constitution Principle IV).