feat: Migrate LangGraph runner to AgentGraphRunnerResult; clean up legacy shape detection #633

Job	Run time
server-ai-optimization-linux (3.13)	13s
server-ai-optimization-linux (3.12)	11s
server-ai-optimization-windows (3.12)	24s
server-ai-langchain-windows (3.14)	28s
server-ai-langchain-windows (3.10)	32s
server-ai-langchain-linux (3.11)	24s
server-ai-langchain-linux (3.10)	20s
server-ai-optimization-windows (3.10)	21s
server-ai-langchain-windows (3.12)	25s
server-ai-langchain-linux (3.12)	20s
server-ai-optimization-linux (3.11)	11s
server-ai-optimization-windows (3.14)	36s
server-ai-openai-linux (3.11)	28s
server-ai-optimization-linux (3.14)	16s
server-ai-langchain-linux (3.13)	24s
server-ai-optimization-windows (3.11)	34s
server-ai-langchain-windows (3.13)	49s
server-ai-optimization-linux (3.10)	15s
server-ai-optimization-windows (3.13)	23s
server-ai-openai-linux (3.12)	25s
server-ai-openai-linux (3.10)	28s
server-ai-langchain-linux (3.14)	20s
server-ai-langchain-windows (3.11)	29s
server-ai-openai-linux (3.13)	24s
server-ai-openai-linux (3.14)	25s
server-ai-openai-windows (3.10)	34s
server-ai-linux (3.14)	16s
server-ai-openai-windows (3.12)	24s
server-ai-openai-windows (3.11)	33s
server-ai-openai-windows (3.14)	47s
server-ai-linux (3.13)	17s
server-ai-linux (3.11)	20s
server-ai-windows (3.13)	29s
server-ai-windows (3.11)	30s
server-ai-linux (3.10)	20s
server-ai-windows (3.12)	26s
server-ai-windows (3.10)	19s
server-ai-openai-windows (3.13)	26s
server-ai-linux (3.12)	15s
server-ai-windows (3.14)	20s
	16m 21s

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