AxFieldOptions
Defined in: https://github.com/ax-llm/ax/blob/7965c876f6a5b641e0cf166e8942e540cfde65e1/src/ax/dsp/standardSchema.ts#L70
Per-field companion options for Standard Schema (zod/valibot/arktype) inputs and outputs. These encode ax-specific hints that schema libraries don’t represent natively.