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- Created opus_orchestrator/nonfiction/classifier.py - PurposeClassifier class with keyword-based classification - LLM-enhanced classification (optional) - ReaderPurpose enum (6 purposes) - ClassificationResult dataclass - Keyword classification covers: - LEARN_HANDS_ON: how to, learn to, tutorial, skills, etc. - UNDERSTAND: understand, why, concept, mental model, etc. - TRANSFORM: change, become, improve, habits, etc. - DECIDE: decide, choose, compare, vs, analysis - REFERENCE: manual, handbook, comprehensive, API - BE_INSPIRED: inspire, story, journey, biography - Tests pass for all 6 purposes with high confidence This is the foundation for the entire nonfiction pipeline (Issue #18).