langgraph-cli 0.4.21 / 0.4.20 — add validate command and remote build support for deploys
langgraph-cli 0.4.21 and 0.4.20 were published (08 Apr). The CLI gained a validate command and added remote build support for langgraph deploy flows; there are also CI/dependency bumps. These changes add new developer tooling for building and validating graph/agent deployments.