feat: Add intelligent fallback and memory management to hanzo dev

- Automatic fallback handler tries all available AI options
- Memory persistence with #memory commands (like Claude Desktop)
- Smart context management with priority-based memories
- Session tracking and user preferences
- Export/import memory capabilities
- Enhanced AI responses with contextual awareness
- Version bump to 0.3.20

test_fallback.py

@@ -0,0 +1,44 @@
+#!/usr/bin/env python3
+"""Test the fallback handler."""
+
+import asyncio
+import sys
+from pathlib import Path
+from rich.console import Console
+
+# Add src to path
+sys.path.insert(0, str(Path(__file__).parent / "pkg" / "hanzo" / "src"))
+
+from hanzo.fallback_handler import FallbackHandler, smart_chat
+
+async def test_fallback():
+    """Test the fallback handler."""
+    console = Console()
+    
+    console.print("\n[bold cyan]Testing Fallback Handler[/bold cyan]\n")
+    
+    # Create handler and check status
+    handler = FallbackHandler()
+    handler.print_status(console)
+    
+    # Test smart chat
+    console.print("\n[bold]Testing smart chat with automatic fallback:[/bold]")
+    
+    test_message = "What is 2 + 2? Reply with just the number."
+    console.print(f"\nMessage: [cyan]{test_message}[/cyan]")
+    
+    response = await smart_chat(test_message, console)
+    
+    if response:
+        console.print(f"\n[green]Success! AI responded:[/green]")
+        console.print(f"[bold]{response}[/bold]")
+    else:
+        console.print("\n[red]Failed to get response from any AI option[/red]")
+        console.print("\n[yellow]Setup suggestions:[/yellow]")
+        console.print(handler.suggest_setup())
+    
+    return response is not None
+
+if __name__ == "__main__":
+    success = asyncio.run(test_fallback())
+    sys.exit(0 if success else 1)