Improve search query generation guidelines in planner

Enhance arXiv API with batch processing and improve planner prompts

Refactor execution and synthesis modules

Improve browser search result processing and enhance system components

Fix arXiv submission date retrieval with dynamic imports and Python 3.13 compatibility

Refactor: Clean up docs and add browser/API utilities

Enhance browser, LLM service, and tool modules with improved functionality

Refine PDF section filtering and search result date handling

Add LLM-based relevance ranking for search results

Rewrite README with updated architecture and features documentation

Update executor, search handler, planner, and validation test

Refactor browser and execution modules: Add content type detection, PDF handling, and improve search result processing

Clean up test files and update requirements and validation tests

Refactor execution module and improve browser/search handling

Update core components: browser, execution, LLM, planning, synthesis, and tools