Push: Add the cmd go

cmd/nebara-tui/main.go

@@ -0,0 +1,40 @@
+// Nebara OS TUI — Visual Baseline v0.1
+// Native terminal management interface for the Nebara S3GX Appliance.
+//
+// Usage:
+//
+//	go run ./cmd/nebara-tui [--mock-state=warning|normal]
+package main
+
+import (
+	"flag"
+	"fmt"
+	"os"
+
+	"github.com/nebara/nebara-os/internal/app"
+	"github.com/nebara/nebara-os/internal/mock"
+)
+
+func main() {
+	stateFlag := flag.String("mock-state", "warning", "Mock state to display: 'warning' or 'normal'")
+	flag.Parse()
+
+	var s mock.State
+	switch *stateFlag {
+	case "normal":
+		s = mock.NormalState()
+	case "warning":
+		s = mock.WarningState()
+	default:
+		fmt.Fprintf(os.Stderr, "Unknown mock state %q. Use 'warning' or 'normal'.\n", *stateFlag)
+		os.Exit(1)
+	}
+
+	appState := app.NewStateFromMock(s)
+	application := app.NewApplication(appState)
+
+	if err := application.Run(); err != nil {
+		fmt.Fprintf(os.Stderr, "fatal: %v\n", err)
+		os.Exit(1)
+	}
+}