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/ups_shutdown.yaml

@@ -24,14 +24,15 @@ input_boolean:
   # mid-test silently reverts these to the safe defaults (armed OFF,
   # dry-run ON). Safe direction, but re-arm after any restart during the
   # supervised Sept 11-12 live test.
+  # (no description: keys — input_boolean rejects them, 2026-09-06)
   pfv_ups_shutdown_armed:
+    # Founder arm. ON + dry-run OFF = real shutdown dispatch.
     name: UPS shutdown chain ARMED
-    description: Founder-level arm. ON + dry-run OFF = real shutdown dispatch.
     icon: mdi:power-standby
     initial: false
   pfv_ups_shutdown_dry_run:
+    # ON (default) = log/page the plan only, touch nothing.
     name: UPS shutdown DRY RUN
-    description: ON (default) = log/page the plan only, touch nothing.
     icon: mdi:numeric-1-box-outline
     initial: true