feat(host_agent): a temperature sensor is judged by how it moves against the CPU (#5783)

A board's spare thermistor inputs report whatever an open input reads, and
the value rule from #5759 only catches the impossible ones. Once an hour,
sensors.refresh judges each sensor against the host's CPU (Package id N,
Tctl/Tdie/TccdN, PECI Agent N) over a week of hourly averages. A sensor is
ruled out if it falls as the CPU warms (r <= -0.5) or holds within 0.5 °C
while the CPU moved 10 °C or more. A judgment needs at least 72 shared hours.

The host temperature leaves judged sensors out at ingest. The host page
lists them under "Not counted", with each reason given once.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

plugins/host_agent/templates/_host_metrics.html

@@ -160,10 +160,12 @@
     {% endfor %}
   </div>
   {% if unwired_temps %}
-  {# Board inputs with nothing wired to them, and readings at or below 0 °C:
-     constant at any load, left out of the host's temperature (#5759). #}
-  <p class="field-hint" style="margin:0.5rem 0 0;">Not counted, reading a constant with nothing wired to them:
-    {% for label, c in unwired_temps.items() %}{{ label }} {{ "%.0f"|format(c) }}°C{{ ", " if not loop.last }}{% endfor %}.</p>
+  {# Sensors that aren't thermometers: they run against the CPU or hold a
+     constant (#5783), or read a value no wired sensor gives (#5759). Left
+     out of the host's temperature. Each reason is said once, after its
+     sensors, hottest first within it. #}
+  <p class="field-hint" style="margin:0.5rem 0 0;">Not counted, likely nothing wired to them:
+    {% for why, group in unwired_temps.items()|groupby("1.1") %}{% for label, v in group %}{{ label }} {{ "%.0f"|format(v[0]) }}°C{{ ", " if not loop.last }}{% endfor %} ({{ why }}){{ "; " if not loop.last }}{% endfor %}.</p>
   {% endif %}
 </div>
 {% endif %}