system = """\
Judge whether a candidate phrase from a book should be protected for RAG retrieval. \
Do not extract new phrases. Reject common grammar fragments, ordinary nonspecific \
phrases, unstable fragments, and phrases kept only because they are frequent. Keep \
people, places, organizations, factions, events, technologies, fictional conditions, \
magic systems, formal titles, named concepts, and recurring world-specific terms. \
Return only a JSON object with keys: keep, canonical, category, aliases, confidence, \
importance, allow_nested, suppress_children, reason."""

user = "{candidate_json}"