feat: fall back to model.parameters.tools when root tools absent #568

Job	Run time
server-ai-langchain-windows (3.12)	23s
server-ai-langchain-windows (3.14)	27s
server-ai-linux (3.14)	17s
server-ai-langchain-windows (3.13)	1m 6s
server-ai-windows (3.14)	21s
server-ai-linux (3.10)	16s
server-ai-langchain-windows (3.10)	34s
server-ai-windows (3.11)	18s
server-ai-windows (3.12)	43s
server-ai-windows (3.10)	21s
server-ai-linux (3.11)	17s
server-ai-linux (3.13)	15s
server-ai-linux (3.12)	17s
server-ai-openai-windows (3.12)	27s
server-ai-langchain-windows (3.11)	30s
server-ai-openai-windows (3.11)	35s
server-ai-windows (3.13)	35s
server-ai-openai-linux (3.13)	28s
server-ai-openai-windows (3.10)	23s
server-ai-langchain-linux (3.12)	21s
server-ai-langchain-linux (3.13)	25s
server-ai-langchain-linux (3.10)	24s
server-ai-langchain-linux (3.14)	23s
server-ai-optimization-windows (3.11)	19s
server-ai-optimization-linux (3.12)	10s
server-ai-openai-linux (3.11)	29s
server-ai-optimization-windows (3.10)	18s
server-ai-openai-windows (3.14)	31s
server-ai-openai-linux (3.10)	26s
server-ai-optimization-linux (3.10)	16s
server-ai-optimization-windows (3.13)	17s
server-ai-openai-linux (3.14)	29s
server-ai-optimization-linux (3.13)	13s
server-ai-langchain-linux (3.11)	20s
server-ai-openai-windows (3.13)	24s
server-ai-openai-linux (3.12)	23s
server-ai-optimization-linux (3.11)	12s
server-ai-optimization-linux (3.14)	12s
server-ai-optimization-windows (3.12)	22s
server-ai-optimization-windows (3.14)	22s
	15m 49s

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