Introducing LangSmith Engine v2: Detect and ship fixes to agents faster

Engine v2 introduces Red Teaming for proactive issue detection by generating and testing hypotheses about potential problems using production traces and repository context. It expands issue detection to include performance trends (error rate, latency, cost) and inefficient agent work (repetitive tool calls, long trajectories). For LangSmith Deployments, it automates the validation of proposed fixes by testing them against offending inputs and a broader eval set before presenting them for human review and one-click PR deployment.