LangChain rolls full LangSmith agent-governance stack: Gateway, Sandboxes GA, SmithDB

LangChain shipped a coordinated wave: LLM Gateway (spend limits + PII redaction), Sandboxes GA (kernel-isolated microVMs), SmithDB (12x faster trace DB), Context Hub, Engine for failure triage, and Deep Agents 0.6 — an end-to-end agent observability and governance platform built on top of LangSmith.