meta files:
- catalog.json / catalog.csv: final structured package summary
- clean_catalog.csv: cleaned entry-level source summary before novel/volume/chapter export
- entry_audit.csv: keep/remove audit for cleaned entries
- removed_entries.json / removed_entries.csv: removed entry log from the cleaning stage
- token_stats_qwen3.json / token_stats_qwen3.csv: Qwen tokenizer token statistics
- MANIFEST.json: package manifest