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ContextBuilder._build_user_content now only handles images (its original responsibility). Document text extraction (PDF, DOCX, XLSX, PPTX) is performed by the new _extract_documents() helper in server.py, called before process_direct(). This keeps the core context builder free of format-specific dependencies and makes the API boundary the single place where uploaded files are pre-processed. Tests updated to reflect the new responsibility boundary. Made-with: Cursor