Case insensitive tool and agent names

[jkellerer]

Thanks for the great toolset.

Had tried it with a locally running Mistral 7b and found that this LLM, while being very usable on commodity HW, doesn't always get case and leading/trailing spaces right. With this change the trip planner example started to work.

This PR adds strip().casefold() for agent names and casefold() for tool names (as strip() was existing already)