Fix conversation automation counter validation

packages/api-contracts/src/config.ts

@@ -1,5 +1,7 @@
 import { z } from 'zod';
 
+export const MAX_CONFIGURED_AUTOMATED_CONVERSATION_TURNS = 20;
+
 export const ToneKeySchema = z.union([
   z.literal('default'),
   z.literal('dominant'),
@@ -27,8 +29,8 @@ export const RuntimeConfigSchema = z.strictObject({
 });
 export const ConversationBehaviourSchema = z.strictObject({
   mode: z.union([z.literal('legacy'), z.literal('r4r'), z.literal('r4r-media'), z.literal('manual')]).default('legacy'),
-  maxAutomatedTurns: z.number().int().min(1).max(20).default(3),
-  rapportTurnsBeforeMediaAsk: z.number().int().min(1).max(19).default(3),
+  maxAutomatedTurns: z.number().int().min(1).max(MAX_CONFIGURED_AUTOMATED_CONVERSATION_TURNS).default(3),
+  rapportTurnsBeforeMediaAsk: z.number().int().min(1).max(MAX_CONFIGURED_AUTOMATED_CONVERSATION_TURNS - 1).default(3),
 }).superRefine((behaviour, context) => {
   if (behaviour.mode === 'r4r-media' && behaviour.rapportTurnsBeforeMediaAsk >= behaviour.maxAutomatedTurns) {
     context.addIssue({