LangGraph 1.2.11 exposes trace_policy on add_node, making per-node observability a graph-level declaration

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Released August 11, LangGraph 1.2.11's headline change is `trace_policy` as an argument on `add_node`, letting you declare tracing behavior per node instead of configuring it globally or wrapping calls — useful when one node handles sensitive payloads or produces trace volume you do not want to pay to store. The release also carries a checkpoint fix for collecting writes at plain-value seeds in delta channel history, ships alongside langgraph-checkpoint 4.2.0 and checkpoint-postgres 3.1.2, and bumps cryptography from 48.0.1 to 50.0.0. Small release, but per-node trace control is the kind of primitive that only shows up once a framework has real production users with compliance constraints.