fix: clarify conflict and response style prompts

Conflict resolution prompts now ask for an analysis-first strategy
Response style instructions are wrapped as system reminders
Prompt templates stay separate from reminder formatting

packages/ui/src/lib/systemReminder.ts

@@ -0,0 +1,15 @@
+const SYSTEM_REMINDER_OPEN = '<system-reminder>';
+const SYSTEM_REMINDER_CLOSE = '</system-reminder>';
+
+export const wrapSystemReminder = (text: string): string => {
+  const trimmed = text.trim();
+  if (!trimmed) {
+    return '';
+  }
+
+  if (trimmed.startsWith(SYSTEM_REMINDER_OPEN) && trimmed.endsWith(SYSTEM_REMINDER_CLOSE)) {
+    return trimmed;
+  }
+
+  return `${SYSTEM_REMINDER_OPEN}\n${trimmed}\n${SYSTEM_REMINDER_CLOSE}`;
+};