feat: Migrate LangGraph runner to AgentGraphRunnerResult; clean up le… #634

Job	Run time
server-ai-langchain-linux (3.10)	19s
server-ai-linux (3.10)	14s
server-ai-linux (3.13)	16s
server-ai-optimization-linux (3.10)	11s
server-ai-linux (3.14)	19s
server-ai-optimization-windows (3.10)	28s
server-ai-linux (3.12)	16s
server-ai-optimization-linux (3.11)	15s
server-ai-linux (3.11)	16s
server-ai-langchain-linux (3.14)	20s
server-ai-optimization-linux (3.12)	10s
server-ai-langchain-linux (3.13)	19s
server-ai-optimization-linux (3.13)	10s
server-ai-optimization-windows (3.11)	26s
server-ai-langchain-linux (3.11)	18s
server-ai-optimization-windows (3.14)	27s
server-ai-windows (3.12)	18s
server-ai-openai-linux (3.12)	28s
server-ai-langchain-windows (3.11)	33s
server-ai-openai-linux (3.13)	28s
server-ai-windows (3.13)	23s
server-ai-langchain-windows (3.14)	35s
server-ai-optimization-linux (3.14)	15s
server-ai-openai-windows (3.12)	36s
server-ai-optimization-windows (3.13)	25s
server-ai-openai-windows (3.11)	27s
server-ai-langchain-windows (3.13)	24s
server-ai-optimization-windows (3.12)	36s
server-ai-langchain-windows (3.10)	23s
server-ai-langchain-windows (3.12)	23s
server-ai-openai-windows (3.14)	27s
server-ai-openai-linux (3.11)	33s
server-ai-langchain-linux (3.12)	19s
server-ai-openai-windows (3.10)	22s
server-ai-openai-linux (3.10)	26s
server-ai-windows (3.14)	25s
server-ai-openai-windows (3.13)	23s
server-ai-openai-linux (3.14)	24s
server-ai-windows (3.10)	23s
server-ai-windows (3.11)	39s
	15m 19s

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