fix(plant): dedupe sensor: key that shadowed all 22 SNMP temps [#344]

Second top-level sensor: key (PDU energy) made YAML last-one-wins drop
the whole first block at config load — every SNMP temp/power entity
stopped being created after the restart that pulled this file.

https://projects.knownelement.com/issues/344#note-3916

packages/plant_snmp.yaml

@@ -330,6 +330,20 @@ sensor:
       {% set m = value | regex_findall('output_amps ([0-9.]+)') %}
       {{ m[0] if m | length > 0 }}
 
+  # --- Garage PDU energy (kWh) integrated from watts [#344] ---
+  # NOTE: lives in THIS sensor: block on purpose — a second top-level
+  # "sensor:" key anywhere in a package shadows the whole first block
+  # (YAML duplicate keys are last-one-wins) and silently kills every
+  # SNMP sensor at next HA restart. Never append a second sensor: key.
+  - platform: integration
+    source: sensor.pfv_garage_pdu_power
+    name: pfv garage PDU energy
+    round: 2
+    unit_prefix: k
+    unit_time: h
+    method: left
+    unique_id: pfv_garage_pdu_energy
+
 template:
   - sensor:
       - name: "PFV garage PDU power"
@@ -365,17 +379,6 @@ binary_sensor:
         min_gradient: 0.011
         unique_id: trend_garage_rising
 
-# --- Garage PDU energy (kWh) from watts [#344] ---
-sensor:
-  - platform: integration
-    source: sensor.pfv_garage_pdu_power
-    name: pfv garage PDU energy
-    round: 2
-    unit_prefix: k
-    unit_time: h
-    method: left
-    unique_id: pfv_garage_pdu_energy
-
 utility_meter:
   garage_pdu_daily:
     source: sensor.pfv_garage_pdu_energy