Fix HuggingFace Spaces deployment and add GPT-5 support

Fix HuggingFace Spaces import error with lazy loading

Update README and enhance query processing with logging and error handling

Refactor document ingestion and processing; update configurations for chunking and retrieval, enhance error logging, and implement markdown-aware chunking

Update dependencies and refactor agent initialization; add optional fact-check skipping for performance improvements

Implement modular RAG email assistant architecture