Clarify execution context for LangGraph tasks/nodes #1208

Job	Run time
build-lint-test (3.10, windows-latest)	8m 3s
build-lint-test (3.10, macos-intel)	7m 14s
build-lint-test (3.14, ubuntu-latest)	8m 56s
build-lint-test (3.14, windows-latest)	11m 21s
build-lint-test (3.14, macos-intel)	11m 58s
build-lint-test (3.14, macos-arm)	8m 41s
build-lint-test (3.10, ubuntu-latest)	6m 19s
build-lint-test (3.10, macos-arm)	6m 44s
	1h 9m 16s

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