feat: add parallelLimit option to evalite.each() for variant concurrency control #371
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Add semaphore-based concurrency control for evalite.each() to limit the number of variants that run concurrently. This enables:
Usage:
evalite.each(variants, { parallelLimit: 2 })("Compare", { ... })
Implementation uses Vitest beforeAll/afterAll hooks with a shared semaphore per variant group to control concurrent execution while maintaining backward compatibility.