AxFieldOptions
Defined in: https://github.com/ax-llm/ax/blob/e4219a44b7581a55a40d9dd62d2c281062ff078d/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.