Study Guide agent

Closes #214 Added a study guide agent to examples that loads .txt and .pdf documents located in agentic/examples/study/docs. The agent uses the weaviate rag tool. The study guide agent has 3 main "modes": - Test Prep: creates a short-answer test and answers - Study Buddy: answers questions about the content in the RAG - Multiple Choice Quiz: generates a multiple choice quiz and an answer key The agent provides citations whenever RAG content is used, and is prompted to use general knowledge as little as possible. Here is a segment from the openstax Calculus textbook (free) that I used for testing: [calc1.pdf](https://github.com/user-attachments/files/21340249/calc1.pdf)