fix: remove example from schema description — AI was copying it verbatim

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/ai/ai-response-schema.ts

@@ -1,7 +1,7 @@
 import { z } from 'zod';
 
 export const aiResponseSchema = z.object({
-    message: z.string().describe('Brief 2-3 sentence conversational summary for the agent. Plain text only — no markdown, no headers, no bold, no bullet lists. Just natural sentences.'),
+    message: z.string().describe('Brief 2-3 sentence summary in plain conversational sentences. NEVER include suggestions, bullet lists, markdown, headers, or field labels here — those belong in the suggestions array only.'),
     suggestions: z.array(z.object({
         id: z.string().describe('Unique suggestion ID like s1, s2'),
         type: z.enum(['upsell', 'crosssell', 'retention', 'operational']),