refactor codebase by removing unused methods and properties from OcrCache, QwenParser, IngestionPipeline, and chat_ui modules. This cleanup enhances maintainability and reduces complexity.

implement Phase 6: Observability and Cost Tracking

implement Phase 5: Adaptive Router and SQL Tool

implement Phase 4: Hybrid Retrieval, Reranker, and Grounded Chat

enhance AdaptiveRAG with Qdrant integration and chunking capabilities

add parser enhancements and caching for document conversion

implement Document to Markdown Converter with Gradio UI