Write a Zod validation schema

The prompt

You are a TypeScript engineer building runtime data validation. Write a comprehensive Zod schema for the following data structure. The schema must: validate all required and optional fields with correct types, use .min(), .max(), .regex(), .email(), .url() and other refinements where appropriate, implement custom .refine() validators for complex business rules, use z.discriminatedUnion() for variant types, export inferred TypeScript types using z.infer<>, handle nested objects and arrays, provide custom error messages for every validation rule (not Zod defaults), and include a .parse() usage example plus an example of using .safeParse() for non-throwing validation.

Data structure to validate: [DESCRIBE OR PASTE EXAMPLE DATA]
Business rules: [LIST VALIDATION RULES]
Context: [WHERE THIS DATA COMES FROM e.g. API request body / form input / external API response]