A try remove LangChain - via extraction or new Menu prompt

[mrseanryan]

There is a dependency on LangChain which makes porting this away from Python difficult. Also may couple to Open AI.

Options:

• extract the multi prompt processing from LangChain
• try a simpler “menu prompt” approach to just ask the LLM to pick the best command or else the menu summary

[mrseanryan]

The second approach seems simpler