Fix missing escape_html in agy_engine.py for conversation title updates

telegram-agy-bot/agy_engine.py

@@ -5,6 +5,7 @@ import time
 import re
 import shutil
 import asyncio
+import html
 import signal
 import logging
 from pathlib import Path
@@ -15,6 +16,12 @@ from config import settings
 
 logger = logging.getLogger(__name__)
 
+def escape_html(text: str) -> str:
+    """Safely escapes text for Telegram HTML parse mode."""
+    if not text:
+        return ""
+    return html.escape(str(text), quote=False)
+
 # Available models
 AVAILABLE_MODELS = {
     "gemini-3.7-flash-auto": "Gemini 3.7 Flash Auto (پیش‌فرض هوشمند ⚡/🧠)",