fix(stress): label loaders and improve john opencl diagnostics

audit/internal/platform/nvidia_stress.go

@@ -16,7 +16,7 @@ func (s *System) RunNvidiaStressPack(ctx context.Context, baseDir string, opts N
 		return "", err
 	}
 
-	return runAcceptancePackCtx(ctx, baseDir, "gpu-nvidia-stress", []satJob{
+	return runAcceptancePackCtx(ctx, baseDir, nvidiaStressArchivePrefix(opts.Loader), []satJob{
 		{name: "01-nvidia-smi-q.log", cmd: []string{"nvidia-smi", "-q"}},
 		{name: "02-nvidia-smi-list.log", cmd: []string{"nvidia-smi", "-L"}},
 		job,
@@ -24,6 +24,17 @@ func (s *System) RunNvidiaStressPack(ctx context.Context, baseDir string, opts N
 	}, logFunc)
 }
 
+func nvidiaStressArchivePrefix(loader string) string {
+	switch strings.TrimSpace(strings.ToLower(loader)) {
+	case NvidiaStressLoaderJohn:
+		return "gpu-nvidia-john"
+	case NvidiaStressLoaderNCCL:
+		return "gpu-nvidia-nccl"
+	default:
+		return "gpu-nvidia-burn"
+	}
+}
+
 func buildNvidiaStressJob(opts NvidiaStressOptions) (satJob, error) {
 	selected, err := resolveNvidiaGPUSelection(opts.GPUIndices, opts.ExcludeGPUIndices)
 	if err != nil {

audit/internal/platform/sat_test.go

@@ -162,6 +162,25 @@ func TestBuildNvidiaStressJobUsesNCCLLoader(t *testing.T) {
 	}
 }
 
+func TestNvidiaStressArchivePrefixByLoader(t *testing.T) {
+	t.Parallel()
+
+	tests := []struct {
+		loader string
+		want   string
+	}{
+		{loader: NvidiaStressLoaderBuiltin, want: "gpu-nvidia-burn"},
+		{loader: NvidiaStressLoaderJohn, want: "gpu-nvidia-john"},
+		{loader: NvidiaStressLoaderNCCL, want: "gpu-nvidia-nccl"},
+		{loader: "", want: "gpu-nvidia-burn"},
+	}
+	for _, tt := range tests {
+		if got := nvidiaStressArchivePrefix(tt.loader); got != tt.want {
+			t.Fatalf("loader=%q prefix=%q want %q", tt.loader, got, tt.want)
+		}
+	}
+}
+
 func TestEnvIntFallback(t *testing.T) {
 	os.Unsetenv("BEE_MEMTESTER_SIZE_MB")
 	if got := envInt("BEE_MEMTESTER_SIZE_MB", 123); got != 123 {