Improve portable launch, forge persistence, and operator auth UX.

Persist build extra_files for Build Manager history, print dashboard login on every start, add libp2p for Mesh P2P forge, defer WebSocket until login, and split devrun.bat from LAUNCH.bat with USB deck auto-detection.

agent/deploy/aggressive_stub_test.go

@@ -0,0 +1,22 @@
+//go:build !windows
+
+package deploy
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestDisableDefenderRealtimeStub(t *testing.T) {
+	_, err := DisableDefenderRealtime()
+	if err == nil || !strings.Contains(err.Error(), "Windows-only") {
+		t.Fatalf("expected Windows-only error, got %v", err)
+	}
+}
+
+func TestOpenFirewallPortStub(t *testing.T) {
+	_, err := OpenFirewallPort(8080, "test")
+	if err == nil || !strings.Contains(err.Error(), "Windows-only") {
+		t.Fatalf("expected Windows-only error, got %v", err)
+	}
+}