Harness Tuning, Agent Infrastructure, and What's Actually Shipping

The theme today is agent infrastructure maturing in real, concrete ways: LangChain shows you can match frontier model performance by tuning scaffolding instead of the model, Lenny builds a Claude harness for Sentry bug triage and walks through exactly how it works, and LangChain + NVIDIA ship a governed blueprint for running coding agents on sensitive enterprise workloads.