fix: complete hardware collection diagnostics

audit/internal/platform/nvidia_config_check_test.go

@@ -165,6 +165,10 @@ func TestRenderNvidiaConfigCheckSummaryOverallStatus(t *testing.T) {
 	if got := renderNvidiaConfigCheckSummary(withWarning); !strings.Contains(got, "overall_status=FAILED") {
 		t.Fatalf("status with warnings missing overall_status=FAILED:\n%s", got)
 	}
+	noGPU := NvidiaConfigCheckStatus{NoGPUs: true}
+	if got := renderNvidiaConfigCheckSummary(noGPU); !strings.Contains(got, "overall_status=UNSUPPORTED") {
+		t.Fatalf("no-GPU summary must be unsupported:\n%s", got)
+	}
 }
 
 // TestRenderNvidiaConfigCheckSummaryIncludesWarningsField guards that a