Add HA start trigger to AC automation

Ensures the automation evaluates current temperature on HA restart,
not just on threshold crossings or toggle enable.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

automations.yaml

@@ -109,6 +109,8 @@
   - entity_id: input_boolean.ac_automation_enabled
     to: 'on'
     trigger: state
+  - trigger: homeassistant
+    event: start
   conditions:
   - condition: state
     entity_id: input_boolean.ac_automation_enabled