AxFieldOptions
Defined in: https://github.com/ax-llm/ax/blob/e690b4823b8309e258594064abe941d4cff6ef89/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.