update summary portion of summary.ai

[george-lhj]

Currently, summary ai allows the user to specify a topic, retrieve n titles from arxiv. Then, the user will be able to select x titles from the output of the agent.

These titles currently are passed into the LLM for summary, but are too large for the context window. We need to be able to run it using either a tool, or write a function in order to help create a more comprehensive summary.