feat: improve brain prompt to aggressively prioritize scrolling over backing out when trapped

GramAddict/core/navigation/brain.py

@@ -16,7 +16,7 @@ def ask_brain_for_action(
 
     cfg = Config()
     url = getattr(cfg.args, "ai_model_url", "http://localhost:11434/api/generate") if hasattr(cfg, "args") else "http://localhost:11434/api/generate"
-    model = getattr(cfg.args, "ai_model", "llama3") if hasattr(cfg, "args") else "llama3"
+    model = getattr(cfg.args, "ai_model", "qwen3.5:latest") if hasattr(cfg, "args") else "qwen3.5:latest"
 
     prompt = (
         f"You are an autonomous Instagram agent. Your ultimate goal is: '{goal}'.\n"
@@ -29,10 +29,11 @@ def ask_brain_for_action(
         prompt += f"Context: {context}\n"
 
     prompt += (
-        "Based on this, which of the available actions should you take next to make progress towards your goal? "
-        "If you need to find an element that is likely off-screen, choosing to scroll is a smart move. "
-        "If you are stuck, choosing to go back or to a main tab is acceptable to reset. "
-        "Reply ONLY with the exact string from the available actions list."
+        "CRITICAL INSTRUCTIONS:\n"
+        "1. If your goal requires an element (like 'following list') that you previously tried but failed to find, it is highly likely hidden off-screen.\n"
+        "2. If you haven't scrolled yet, you MUST choose to 'scroll down' or 'scroll up' to reveal more of the screen.\n"
+        "3. Only choose 'press back' or 'tap home tab' if you are completely trapped or in the wrong section entirely.\n"
+        "4. DO NOT hallucinate actions. Reply ONLY with the exact string from the available actions list."
     )
 
     try: