feat: parse quest using zod, basic

packages/constants/src/quest/command-responder.ts

@@ -0,0 +1,11 @@
+import { z } from 'zod'
+import { conditionSchema } from './condition.js'
+import { responseSchema } from './response.js'
+
+export const commandResponderSchema = z.object({
+  condition: conditionSchema.optional(),
+  responses: z.array(responseSchema),
+  hints: z.array(z.string()),
+})
+
+export type CommandResponder = z.infer<typeof commandResponderSchema>