langgraph: update get_state to handle nested subgraph state #1367

Job	Run time
build	7s
lint-js (libs/sdk-js)	16s
CLI integration test / CLI integration test (3.10)	6s
CLI integration test / CLI integration test (3.11)	6s
cd libs/checkpoint-postgres / test #3.9	33s
cd libs/checkpoint / test #3.9	22s
cd libs/checkpoint-postgres / test #3.10	25s
cd libs/checkpoint / test #3.10	9s
cd libs/checkpoint-postgres / test #3.11	26s
cd libs/checkpoint / test #3.11	26s
cd libs/checkpoint-postgres / test #3.12	31s
cd libs/checkpoint / test #3.12	12s
cd libs/checkpoint-sqlite / test #3.9	14s
cd libs/checkpoint-sqlite / test #3.10	19s
cd libs/cli / test #3.9	4s
cd libs/checkpoint / lint #3.9	17s
cd libs/checkpoint-sqlite / test #3.11	22s
cd libs/cli / test #3.10	5s
cd libs/checkpoint / lint #3.11	19s
cd libs/checkpoint-sqlite / test #3.12	18s
cd libs/cli / test #3.11	6s
cd libs/cli / test #3.12	7s
cd libs/langgraph / test #3.9	2m 51s
cd libs/langgraph / test #3.10	3m 1s
cd libs/checkpoint-postgres / lint #3.9	31s
cd libs/checkpoint-sqlite / lint #3.9	21s
cd libs/langgraph / test #3.11	3m 1s
cd libs/checkpoint-postgres / lint #3.11	30s
cd libs/langgraph / test #3.12	3m 1s
cd libs/checkpoint-sqlite / lint #3.11	21s
cd libs/cli / lint #3.9	5s
cd libs/cli / lint #3.11	4s
cd libs/langgraph / lint #3.9	1m 1s
cd libs/langgraph / lint #3.11	55s
cd libs/sdk-py / lint #3.9	5s
cd libs/sdk-py / lint #3.11	6s
CI Success	1s
	21m 44s

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