thermal: watch NVMe/RP1 temps, fan stall, and undervoltage on the Pi 5

van-thermal grows sensor kinds beyond plain temperatures: "fan" alerts when
pwmfan is commanded on (pwm > 0) but reads 0 RPM (warn on first sample, crit
if it persists — 0 RPM with pwm 0 is just the firmware idling a cool SoC),
and "undervolt" goes crit on the live rpi_volt alarm plus a sticky warn off
the firmware's latched since-boot bit, so dips shorter than the 10s sample
interval still surface once. All kinds share the existing hysteresis /
journal / Pushover machinery (fan 🌀, undervolt ⚡).

Config adds nvme Composite (65/70), rp1_adc (80/85 — the RP1 die drives all
USB/eth I/O), fan, and undervolt to the existing cpu sensor. The CSV logger
now derives per-kind columns and self-rotates when the header changes; the
Cockpit Temps card renders RPM + pwm duty and undervoltage state alongside
the temperatures.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

power/thermal-config.json

@@ -12,6 +12,31 @@
       "warn": 80,
       "crit": 85,
       "clear_margin": 5
+    },
+    {
+      "name": "nvme",
+      "hwmon": "nvme",
+      "label": "Composite",
+      "warn": 65,
+      "crit": 70,
+      "clear_margin": 5
+    },
+    {
+      "name": "rp1",
+      "hwmon": "rp1_adc",
+      "warn": 80,
+      "crit": 85,
+      "clear_margin": 5
+    },
+    {
+      "name": "fan",
+      "kind": "fan",
+      "hwmon": "pwmfan"
+    },
+    {
+      "name": "undervolt",
+      "kind": "undervolt",
+      "hwmon": "rpi_volt"
     }
   ]
 }