chat: point at the two commands that actually start a local endpoint

`hanzo router start` and `hanzo serve` are neither of them commands. The cloud
comes up with `hanzo up`; one model with `hanzo engine serve`.

pkg/hanzo/src/hanzo/commands/chat.py

@@ -109,8 +109,8 @@ async def ask_once(
                 console.print(
                     "[yellow]No local AI server running.[/yellow]\n"
                     "Start one of:\n"
-                    "  • Hanzo router: hanzo router start\n"
-                    "  • Local node: hanzo serve"
+                    "  • The cloud: hanzo up\n"
+                    "  • One model: hanzo engine serve <model>"
                 )
                 return