Read the CPU temperature instead of the alarm threshold beside it

lm-sensors prints high= and crit= on the same line as the reading, so scraping
the line for its largest number reported a flat 100C on Intel while the shell's
last-field parse got a bare ")" and never fired at all. One parse in the
adapter now, preferring Tdie over Tctl since Tctl carries a +27C offset.

Plugin/unraid/adapter.sh

@@ -203,6 +203,46 @@ platform_get_temp_thresholds() {
     echo "${hdd_hot:-45} ${hdd_max:-55} ${ssd_hot:-60} ${ssd_max:-70}"
 }
 
+# ──────────────────────────────────────────────────────────────────────────────────────────────
+# platform_get_cpu_temp
+#   Writes the CPU temperature in °C to stdout as a decimal, or nothing if no sensor answers.
+#   Returns 1 when nothing could be read, so a caller can tell "no sensor" from "cold".
+#
+#   Two things make this harder than it looks, and both produced wrong numbers for months:
+#
+#   1. lm-sensors prints the alarm thresholds on the same line as the reading:
+#        Core 0:  +63.0 C  (high = +80.0 C, crit = +100.0 C)
+#      Anything that scrapes numbers off the whole line and takes the largest reports 100 —
+#      the critical threshold — as the current temperature, on every Intel box, forever. The
+#      parenthetical is stripped before a single digit is read.
+#
+#   2. On AMD, Tctl is not the die temperature. It is a control value carrying a fixed offset
+#      (+27°C on Threadripper), which is why HOST1 read 70 while the die was at 43. Tdie is the
+#      real measurement and is preferred wherever both are published.
+#
+#   Preference order: Tdie, then Intel's package sensor, then the board's own CPU Temp, then the
+#   hottest individual core. The first label that answers wins; within a label the maximum is
+#   taken, because a multi-die part publishes one line per die and the hottest is the one that
+#   matters.
+# ──────────────────────────────────────────────────────────────────────────────────────────────
+platform_get_cpu_temp() {
+    command -v sensors >/dev/null 2>&1 || return 1
+
+    local out label value
+    out=$(sensors 2>/dev/null | sed 's/(.*//')      # drop "(high = ..., crit = ...)"
+    [[ -n "$out" ]] || return 1
+
+    for label in 'Tdie' 'Package id 0' 'CPU Temp' 'Core '; do
+        value=$(echo "$out" | grep -i "^[[:space:]]*${label}" \
+                | grep -oE '[+-]?[0-9]+\.[0-9]+' | sort -n | tail -1)
+        if [[ -n "$value" ]]; then
+            echo "${value#+}"          # bash printf tolerates a leading +, PHP casts fine, awk does not
+            return 0
+        fi
+    done
+    return 1
+}
+
 # ──────────────────────────────────────────────────────────────────────────────────────────────
 # platform_is_maintenance_running
 #   Returns 0 if a parity check or sync is currently in progress.