Stream_events now type-safe; trace_policy on add_node; TracePolicy reverted

Changes since 1.2.9

• release(langgraph): 1.2.10 (#8462)
• chore(deps): bump jupyterlab from 4.5.9 to 4.5.10 in /libs/langgraph (#8440)
• chore(deps): bump setuptools from 80.9.0 to 83.0.0 in /libs/langgraph (#8435)
• feat(langgraph): type v3 stream_events return and native projections (#8389)
• revert(langgraph): delete TracePolicy (#8403)
• feat(langgraph): drop tags from TracePolicy (#8402)
• feat(langgraph): expose trace_policy on add_node (#8362)
• chore(deps): bump mistune from 3.2.1 to 3.3.0 in /libs/langgraph (#8317)
• chore(deps): bump soupsieve from 2.8.1 to 2.8.4 in /libs/langgraph (#8318)
• chore(cli): allow langgraph-api versions up to 1.0.0 (#8319)