LangGraph v1.2 Ships May 11 With Per-Node Timeouts, Error Handlers, Graceful Shutdown, and Content-Block-Centric Streaming

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LangChain's agent orchestration framework released v1.2 with four major additions: per-node timeouts via TimeoutPolicy (wall-clock and idle limits), node-level error handlers for Saga/compensation patterns after retry exhaustion, cooperative graceful shutdown that saves a resumable checkpoint after the current superstep, and a content-block-centric streaming API v3 with typed per-channel projections. Also fixes time travel with interrupts in subgraphs (replays no longer reuse stale RESUME values) and adds Python 3.10-3.14 support.