chore: prepare Hermes for Homebrew packaging (#4099)

Co-authored-by: Yabuku-xD <78594762+Yabuku-xD@users.noreply.github.com>

hermes_cli/banner.py

@@ -432,10 +432,11 @@ def build_welcome_banner(console: Console, model: str, cwd: str,
     try:
         behind = get_update_result(timeout=0.5)
         if behind and behind > 0:
+            from hermes_cli.config import recommended_update_command
             commits_word = "commit" if behind == 1 else "commits"
             right_lines.append(
                 f"[bold yellow]⚠ {behind} {commits_word} behind[/]"
-                f"[dim yellow] — run [bold]hermes update[/bold] to update[/]"
+                f"[dim yellow] — run [bold]{recommended_update_command()}[/bold] to update[/]"
             )
     except Exception:
         pass  # Never break the banner over an update check