fix(plant): review-gate fixes — level-based UPS re-polls, test hardening [#790 #344]

Adversarial review verdict FAIL -> addressed: runtime-low + shutdown
chain re-poll /5 min (edge-crossing could miss a page mid-outage);
suppression stamp set after notify; plan body names all 7 hosts
explicitly; test fixes (pipefail SIGPIPE, comment-only assertion).
Reviewer P1 'tripp_lite slug' refuted with live entity registry
evidence (entity_id derives from name; sensor exists, 8f48730 aligned).
On-box ha core check passed with the changed files.

Review thread: #3

automations.yaml

@@ -79,14 +79,25 @@
     - sensor.pfv_ups_runtime_minutes
     - sensor.pfv_tripp_lite_runtime_minutes
     below: 10
+  # 5-min level re-check: numeric_state alone fires only on the threshold
+  # CROSSING — a blip at that minute (or an HA restart mid-outage) would
+  # silence the page for the whole discharge. Level-based polling turns
+  # this into an escalation ladder while the outage persists.
+  - trigger: time_pattern
+    minutes: /5
   conditions:
   - condition: template
     value_template: >-
-      {% set status_map = {
-           'sensor.pfv_ups_runtime_minutes': 'sensor.tsys1_ups_status',
-           'sensor.pfv_tripp_lite_runtime_minutes': 'sensor.tsys1_triplite_status'} %}
-      {{ states(status_map.get(trigger.entity_id, 'sensor.tsys1_ups_status'))
-         not in ['Online', 'OL', 'unknown', 'unavailable'] }}
+      {% set ns = namespace(hit=false) %}
+      {% for rt, st in [
+           ('sensor.pfv_ups_runtime_minutes', 'sensor.tsys1_ups_status'),
+           ('sensor.pfv_tripp_lite_runtime_minutes', 'sensor.tsys1_triplite_status')] %}
+        {% if is_number(states(rt)) and (states(rt) | float) < 10
+              and states(st) not in ['Online', 'OL', 'unknown', 'unavailable'] %}
+          {% set ns.hit = true %}
+        {% endif %}
+      {% endfor %}
+      {{ ns.hit }}
   actions:
   - action: notify.send_message
     target: