Add host temperature telemetry and history

docs/guides/native-hosts.md

@@ -354,6 +354,40 @@ journalctl -u electric-cherry-update.service -n 100
 
 ## Placement and resource capacity
 
+### Host temperature
+
+Agent **1.10.0** reports temperature sensors exposed by supported Linux hwmon
+drivers without installing additional packages. **Hosts** shows CPU temperature
+beneath CPU usage. A host's **Overview → Inventory** shows the selected reading
+and expandable **Temperature sensors**, including per-core and storage details.
+Stale readings are marked as last reported; absent or failed readings are
+**Unavailable**, never zero or a readiness failure.
+
+**Fleet → Capacity → Temperature history** uses the existing host selector and
+Last hour / 24 hours / 7 days controls. **All hosts** displays a separate CPU line
+for each host. Select one host to add its NVMe composite and chipset lines using
+the legend. Hover, tap, or use the arrow keys on the chart to inspect a period.
+Each host page's **Capacity** button opens the view filtered to that host.
+The game filter affects launch estimates, not temperatures.
+
+The CPU reading is the hottest reported package, falling back to a physical
+AMD die/CCD and then a core reading. AMD Tctl cooling-control values are excluded
+because they may include an offset. Supported device drivers are `coretemp`,
+`k10temp`, `nvme` and `pch_*`; sensor availability depends on hardware and drivers.
+Virtual machines and older agents may have no supported readings. Missing,
+faulty and disabled sensors are skipped individually.
+
+Temperature history starts after the agent upgrade. The controller stores one
+peak per sensor per minute, limited to the CPU summary and up to sixteen NVMe
+composite/chipset inputs per host. Longer chart periods show the maximum of
+those peaks; a period without readings remains a gap. Brief gaps within an
+aggregated period may still leave a peak for that period. **Host resource history
+retention** applies to CPU, memory and temperature samples (seven days by default;
+zero keeps them indefinitely). Series colors identify hosts/sensors and do not
+indicate thermal safety. Temperature does not change placement or trigger alerts.
+
+### CPU and memory capacity
+
 ### Host inventory and eligibility
 
 The Inventory panel shows CPU usage with agent 1.4.2 and later. It measures