Floor shows a staged BIOS update from the start of WinPE; NIC speed past 4.29 Gb/s

- winpe-status-push.ps1: check-bios.cmd stages the firmware update before
  the imaging menu, but startnet's 'BIOS firmware update' push only comes
  at the end of WinPE, so builds showed a plain 'Applying image' for the
  whole apply. The first push now reports the staged update when
  X:\bios-fired.flag exists, and the floor shows 'Applying image - BIOS
  update staged' (do not power off during the next reboot). Also: CIM
  fallback for the serial where wmic is missing, and standard/engineer
  always report 5 steps.
- Network pill: cdc_ncm (e.g. the WisdPI RTL8157 5G adapter) keeps link
  speed in a 32-bit bits/s field, so 5 Gb/s reads 705 Mb/s; show the real
  speed with a note.

Tested in the win11 VM (with and without the BIOS flag, and the late
startnet push).

webapp/templates/dashboard.html

@@ -30,7 +30,7 @@
           {{ 'Up' if i.link == 'up' else 'No link' }}{% if i.speed_mbps %}, {% if i.speed_mbps >= 1000 %}{{ (i.speed_mbps // 1000) if i.speed_mbps % 1000 == 0 else (i.speed_mbps / 1000) | round(1) }} Gb/s{% else %}{{ i.speed_mbps }} Mb/s{% endif %}{% endif %}
           {% if i.addrs %}<span class="mono">{{ i.addrs | join(', ') }}</span>{% endif %}
           {% if i.dnsmasq_bound is not none %}<br>DHCP/PXE {{ 'served here' if i.dnsmasq_bound else 'not served here' }}{% endif %}
-          {% for e in i.evidence %}<br>{{ e }}{% endfor %}
+          {% for e in i.evidence %}<br>{{ e }}{% endfor %}{% for n in i.notes or [] %}<br><span class="sub">{{ n }}</span>{% endfor %}
         </div>
       </div>
       {% else %}