feat: bake sampling_rate into Judge at construction; simplify Evaluator to List[Judge] #588

Job	Run time
server-ai-windows (3.13)	22s
server-ai-windows (3.12)	27s
server-ai-openai-windows (3.10)	25s
server-ai-windows (3.14)	21s
server-ai-openai-windows (3.12)	23s
server-ai-linux (3.11)	17s
server-ai-linux (3.14)	17s
server-ai-openai-windows (3.11)	30s
server-ai-langchain-linux (3.12)	22s
server-ai-langchain-linux (3.11)	23s
server-ai-langchain-linux (3.10)	23s
server-ai-openai-windows (3.13)	41s
server-ai-linux (3.13)	15s
server-ai-linux (3.12)	18s
server-ai-windows (3.11)	26s
server-ai-linux (3.10)	17s
server-ai-langchain-linux (3.13)	23s
server-ai-windows (3.10)	1m 14s
server-ai-openai-windows (3.14)	26s
server-ai-langchain-windows (3.13)	26s
server-ai-langchain-linux (3.14)	22s
server-ai-optimization-windows (3.12)	19s
server-ai-langchain-windows (3.14)	26s
server-ai-optimization-windows (3.14)	33s
server-ai-optimization-windows (3.11)	19s
server-ai-langchain-windows (3.11)	23s
server-ai-optimization-windows (3.10)	19s
server-ai-optimization-windows (3.13)	17s
server-ai-langchain-windows (3.10)	23s
server-ai-openai-linux (3.11)	24s
server-ai-langchain-windows (3.12)	22s
server-ai-optimization-linux (3.14)	14s
server-ai-optimization-linux (3.11)	11s
server-ai-openai-linux (3.14)	30s
server-ai-optimization-linux (3.13)	11s
server-ai-openai-linux (3.12)	25s
server-ai-openai-linux (3.10)	25s
server-ai-openai-linux (3.13)	26s
server-ai-optimization-linux (3.10)	13s
server-ai-optimization-linux (3.12)	14s
	15m 32s

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