W2.B.5 — pin langgraph to 0.2.76#62
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Pin langgraph to ==0.2.76, the version exercised by the W2.B.4 fanout-race test: - Send-based parallel-edge dispatch via add_conditional_edges(START, router, [\"branch\"]); - reducer-annotated TypedDict fields merge correctly; - 4-way fanout with 0-500ms randomized delays merges to byte- identical executor_results across runs (HMAC ledger chain reproducibility per ARCHITECTURE.md §2). Floor-with-ceiling (>=0.2.50,<0.3) is replaced with an exact pin because BUILD_PLAN W2.B.5 specifies pinning to the version that passes the fanout race; bumping the floor without rerunning the race test is a chain-of-custody risk. Bumping the pin requires running pytest tests/graph/test_fanout_race.py against the new version first. Tests: 31 passed unchanged.
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Summary
langgraph>=0.2.50,<0.3with an exact pin to==0.2.76— the version exercised by the W2.B.4 fanout-race test.pytest tests/graph/test_fanout_race.pyagainst the new version first.Test plan
pytest tests/graph/ -q— 31 passed unchanged.ruff check— clean.Base
This PR targets
feat/W2.B.4-fanout-reducer-race.