LangGraph 1.2.11 Adds Trace Policy to Nodes, Updates Checkpoints

LangGraph 1.2.11 introduces a `trace_policy` option for the `add_node` function, allowing developers to customize tracing behavior for individual graph nodes. This release also includes updates for the `checkpoint-postgres` and `checkpoint-sqlite` packages, addressing a fix related to collecting writes in delta channel history. The changes are relevant for engineers building agentic applications with LangGraph, particularly those managing state via checkpoints. Additionally, this version incorporates various dependency updates and internal chore improvements.