Enhance model selection and tool creation with improved error handling, add content validation in chunking, and refine agent response logic for better user interaction and reliability

Refactor retrieval and agent functions for improved chunk handling and error management

Refactor agentic_rag function to include memory parameter and enhance prompt clarity with detailed instructions for context usage and search behavior.

Update agentic_rag function to clarify context usage in responses

Refactor PDF processing and embedding creation; update chunking to include metadata

Refactor preprocessing.py to enhance PDF processing and integrate FAISS for similarity search

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