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- Created nonfiction_taxonomy.py with: - ReaderPurpose enum (6 purposes) - StructuralPattern enum (7 patterns) - PURPOSE_STRUCTURE_MATRIX for intelligent selection - NONFICTION_FRAMEWORKS (14+ frameworks) - select_framework() function - Created docs/NONFICTION_PIPELINE.md documenting the workflow This is the foundation for Issue #16 (Nonfiction Underdeveloped)