Wei Yang (William) Submit HW6

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This pull request contains my Week 6 homework submission for the MLE in GenAI course.

The notebook extends my Week 3 voice agent by adding LLM function calling and tool routing:

Implements structured JSON-based tool calls from the LLM

Adds two tools:

calculate(expression) for mathematical queries

search_arxiv(query) backed by my Week 5 SQLite chunk database

Includes routing logic with fallback handling to ensure correct tool usage

Demonstrates multiple tool calls with logged examples

Provides a FastAPI endpoint illustrating an end-to-end voice interaction pipeline

Notebook: WeiYang-HW6-submmit.ipynb

The submission is self-contained and runs end-to-end within the notebook.