fix: Use gemini-2.5-flash as default (confirmed working)

fix: Add models/ prefix to Gemini model names

feat: Add local embeddings to bypass API rate limits

fix: Simplify __init__.py to fix import error

docs: Organize project with clear README and clean exports

chore: Remove unused files (rate_limit_config, setup.py, ingestor, cli)

feat: Add MCP + CrewAI integration with multi-mode interface

Refactor: Upgraded to Agentic Chatbot with AST & Call Graph support