fix: run john stress in parallel per GPU, fix chromium fullscreen, filter BMC virtual disks

- bee-john-gpu-stress: spawn one john process per OpenCL device in parallel
  so all GPUs are stressed simultaneously instead of only device 1
- bee-openbox-session: --start-fullscreen → --start-maximized to fix blank
  white page on first render in fbdev environment
- storage collector: skip Virtual HDisk* devices reported by BMC/iDRAC

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

audit/internal/collector/storage.go

@@ -77,11 +77,24 @@ func discoverStorageDevices() []lsblkDevice {
 		if dev.Type != "disk" {
 			continue
 		}
+		if isVirtualBMCDisk(dev) {
+			slog.Debug("storage: skipping BMC virtual disk", "name", dev.Name, "model", dev.Model)
+			continue
+		}
 		disks = append(disks, dev)
 	}
 	return disks
 }
 
+// isVirtualBMCDisk returns true for BMC/IPMI virtual USB mass storage devices
+// that appear as disks but are not real hardware (e.g. iDRAC Virtual HDisk*).
+// These have zero reported size, a generic fake serial, and a model name that
+// starts with "Virtual HDisk".
+func isVirtualBMCDisk(dev lsblkDevice) bool {
+	model := strings.ToLower(strings.TrimSpace(dev.Model))
+	return strings.HasPrefix(model, "virtual hdisk")
+}
+
 func lsblkDevices() []lsblkDevice {
 	out, err := exec.Command("lsblk", "-J", "-d",
 		"-o", "NAME,TYPE,SIZE,SERIAL,MODEL,TRAN,HCTL").Output()