feat: Update LangChain runners to implement Runner protocol returning RunnerResult #606

Job	Run time
server-ai-openai-windows (3.11)	34s
server-ai-langchain-linux (3.11)	19s
server-ai-openai-linux (3.11)	24s
server-ai-langchain-linux (3.12)	23s
server-ai-langchain-linux (3.10)	21s
server-ai-openai-windows (3.14)	23s
server-ai-openai-windows (3.13)	23s
server-ai-openai-windows (3.12)	25s
server-ai-openai-windows (3.10)	2m 11s
server-ai-openai-linux (3.12)	26s
server-ai-langchain-linux (3.14)	24s
server-ai-langchain-linux (3.13)	24s
server-ai-openai-linux (3.13)	27s
server-ai-openai-linux (3.10)	26s
server-ai-optimization-linux (3.10)	14s
server-ai-linux (3.14)	22s
server-ai-windows (3.14)	47s
server-ai-linux (3.10)	18s
server-ai-optimization-linux (3.13)	12s
server-ai-openai-linux (3.14)	28s
server-ai-linux (3.12)	17s
server-ai-windows (3.11)	21s
server-ai-optimization-linux (3.12)	11s
server-ai-windows (3.13)	32s
server-ai-langchain-windows (3.14)	1m 34s
server-ai-optimization-linux (3.11)	15s
server-ai-windows (3.10)	22s
server-ai-langchain-windows (3.13)	23s
server-ai-optimization-linux (3.14)	13s
server-ai-langchain-windows (3.12)	24s
server-ai-langchain-windows (3.11)	40s
server-ai-windows (3.12)	20s
server-ai-optimization-windows (3.14)	21s
server-ai-optimization-windows (3.10)	31s
server-ai-optimization-windows (3.12)	21s
server-ai-langchain-windows (3.10)	37s
server-ai-optimization-windows (3.11)	18s
server-ai-optimization-windows (3.13)	20s
server-ai-linux (3.11)	20s
server-ai-linux (3.13)	16s
	18m 27s

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