docs/ai_tool_usage.md

## AI Tool Usage Log

- **LangChain + OpenAI GPT-3.5**: Used to generate market summary responses via RetrievalQA.
- **FAISS + HuggingFaceEmbeddings**: For semantic document search on financial notes.
- **yfinance**: Fetched real-time stock prices and % change for TSM, SSNLF.
- **BeautifulSoup**: Scraped latest headlines from MarketWatch.
- **SpeechRecognition + pyttsx3**: Converted user voice input to text and generated audio output.