fix(plant): filter sensors via legacy filter platform; drop input_boolean description

Top-level 'filter:' cannot merge from packages (expected dict); the
booleans rejected 'description'. Both found live in the 12:38 deploy:
package booleans + smoothed sensors failed to materialize.

Meat: https://projects.knownelement.com/issues/344#comment

packages/plant_snmp.yaml

@@ -542,36 +542,44 @@ sensor:
     method: left
     unique_id: pfv_garage_pdu_energy
 
-# --- Rate-of-change early warning (#682): +10°F/15min = AC trouble [#344] ---
-# DRAC sensors quantize to whole °C and FLAP ~1.8°F between polls; raw-fed
-# trend sensors false-tripped TEMP RISING FAST (2026-09-06 05:02 CDT, tsys6).
-# Trend inputs are 5-min time-weighted moving averages — real climbs survive
-# the smoothing, quantization flapping does not.
-filter:
-  - platform: time_simple_moving_average
+  # --- Smoothed ambient feeds for the trend sensors (2026-09-06) ---
+  # DRAC sensors quantize to whole °C and FLAP ~1.8°F between polls; raw-fed
+  # trend sensors false-tripped TEMP RISING FAST (05:02 CDT, tsys6). Trend
+  # inputs are 5-min time-weighted moving averages (legacy filter SENSOR
+  # platform — a top-level `filter:` key cannot be merged from packages).
+  # Real climbs survive the smoothing, quantization flapping does not.
+  - platform: filter
     name: "PFV tsys1 rack temperature smoothed"
-    entity_id: sensor.pfv_tsys1_rack_temperature
-    window: "00:05:00"
-    precision: 2
     unique_id: pfv_tsys1_rack_temperature_smoothed
-  - platform: time_simple_moving_average
+    entity_id: sensor.pfv_tsys1_rack_temperature
+    filters:
+      - filter: time_simple_moving_average
+        window: "00:05"
+        precision: 2
+  - platform: filter
     name: "PFV tsys6 DRAC ambient smoothed"
-    entity_id: sensor.pfv_tsys6_drac_ambient
-    window: "00:05:00"
-    precision: 2
     unique_id: pfv_tsys6_drac_ambient_smoothed
-  - platform: time_simple_moving_average
+    entity_id: sensor.pfv_tsys6_drac_ambient
+    filters:
+      - filter: time_simple_moving_average
+        window: "00:05"
+        precision: 2
+  - platform: filter
     name: "PFV tsys7 DRAC inlet smoothed"
-    entity_id: sensor.pfv_tsys7_drac_inlet
-    window: "00:05:00"
-    precision: 2
     unique_id: pfv_tsys7_drac_inlet_smoothed
-  - platform: time_simple_moving_average
+    entity_id: sensor.pfv_tsys7_drac_inlet
+    filters:
+      - filter: time_simple_moving_average
+        window: "00:05"
+        precision: 2
+  - platform: filter
     name: "PFV garage temperature smoothed"
-    entity_id: sensor.pfv_garage_temperature
-    window: "00:05:00"
-    precision: 2
     unique_id: pfv_garage_temperature_smoothed
+    entity_id: sensor.pfv_garage_temperature
+    filters:
+      - filter: time_simple_moving_average
+        window: "00:05"
+        precision: 2
 
 binary_sensor:
   - platform: trend