Improve response time

[itsderek23]

Currently the CLI has a response time of ~40 sec when answering an AWS-related question.

Look into options for improving the performance.

[itsderek23]

While I don't have updated benchmarks to share yet, the response time on many questions is quite a bit faster. The agent will now re-use functions that are human-validated vs. re-generating new functions all of the time. I've also reduced the number of messages required to answer a question.

For example, note this took ~5 seconds vs 40+ seconds:

time llm "average ec2 cpu utilization"
The average CPU utilization of your EC2 instances over the past hour is approximately 5.20%.
llm "average ec2 cpu utilization"  0.22s user 0.07s system 5% cpu 4.935 total