Fix: use ddgs package (renamed from duckduckgo-search)

ReAct agent rewrite: multi-step reasoning, web scraper, code executor, 9 tools

Fix file download, YouTube transcripts, search queries, username

Add rate limiting, retry with backoff, no-NA answers, updated app.py

Fix swapped search/wikipedia tools and set explicit en lang

hi

fix: replace duckduckgo-search with ddgs package

fix: migrate deprecated langchain imports in tools.py to langchain_community

fix: migrate deprecated langchain imports to langchain_core and langchain_community

first

initial commit