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/__init__.py

@@ -43,8 +43,8 @@ def get_audit_entities() -> dict:
 
 
 def get_scheduled_tasks() -> list:
-    from .scheduler import make_maintenance_task, make_task
-    return [make_task(_app), make_maintenance_task(_app)]
+    from .scheduler import make_maintenance_task, make_sensor_task, make_task
+    return [make_task(_app), make_maintenance_task(_app), make_sensor_task(_app)]
 
 
 def get_blueprint():