the hex team consistently gets what it means to build agents, and software to support them three things that caught my eye from Hex 4.0 that mirror what we've done at LangChain and that I think speak to the future of building agents 1/ use code as a backbone. they moved from yaml to more flexible code. agents are really good at writing code, and people want lots of flexibility in UI, so i think we will see more teams have parts of their UI that are powered by code. We did this in LangSmith…