Changes since langchain==1.2.8
fix(langchain): normalize raw schemas in middleware response_format override (#35019)
feat: support state updates from wrap_model_call with command(s) (#35033)
test(langchain): types in test_tool_call_limit and test_model_retry (#34629)
fix(langchain): bump min core version and improve approximate token counting (#35026)
release: langchain 1.2.9 (#35023)
feat: threading context through create_agent flows + middleware (#34978)
chore: add make type target (#35015)
revert: "chore: add typing target in Makefile" (#35013)
chore: add typing target in Makefile (#35012)
revert: use usage metadata scaling in SummarizationMiddleware default token counter (#35002)
fix(langchain): use usage metadata scaling in SummarizationMiddleware default token counter (#35001)
fix(langchain): avoid UnboundLocalError when no AIMessage exists (#34816)
chore: enrich pyproject.toml files (#34980)