Implement Query Expansion System with Comprehensive Testing

feat: enhance RAG system for complex documents with improved chunking, retrieval, and prompting strategies

feat: restore message histories and implement automatic cleanup to prevent memory leaks

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fix: correct indentation for fallback upload folder print statement

feat: implement session and file management with automatic cleanup and logging

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ws

Merge branch 'main' of https://huggingface.co/spaces/HyperxD-0/cognichat

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fix

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Fix cache permission issues

huihu

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Fix cache directory permissions and use proper .cache directory structure

Fix dependency conflicts: use langchain-community embeddings instead of langchain-huggingface

Fix HF Spaces deployment: simplify dependencies and remove unstructured loaders

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