feat(langgraph): migrate LangGraph harness onto unified surface#417

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Commits on Jun 18, 2026

feat(langgraph): optional on_final_ai_message callback for usage capture

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feat(langgraph): LangGraphTurn + langgraph_usage_to_turn_usage

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test(langgraph): characterization tests for stream_langgraph_events (pre-refactor)

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refactor(langgraph): reimplement stream_langgraph_events on unified surface

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test(langgraph): unified sync path — passthrough and span derivation

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test(langgraph): 4 conformance fixtures (text, tool, reasoning, multi-step)

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test(langgraph): offline integration tests for sync, async, and temporal channels

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feat(langgraph): tutorial agents + CI live-matrix + pyright fixes

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fix(langgraph): restore created_at + docstring-only deprecation for tracing handler (PR 5/6)

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