refactor: enforce strict profile register isolation without global fallback defaults

Author: tazomatalax

custom_components/midea_heatpump_hws/coordinator.py

@@ -68,7 +68,7 @@ def __init__(
         self.mode_register = config.get(CONF_MODE_REGISTER)
         self.temp_register = config.get(CONF_TEMP_REGISTER)
         self.target_temp_register = config.get(CONF_TARGET_TEMP_REGISTER)
-        self.sterilize_register = config.get(CONF_STERILIZE_REGISTER, 3)
+        self.sterilize_register = config.get(CONF_STERILIZE_REGISTER)
 
         # Temperature scaling (general sensor / temp)
         # Keep backwards compatibility: use provided CONF_TEMP_* as fallback
@@ -107,7 +107,7 @@ def __init__(
         # Diagnostic state registers (raw integer, no scaling)
         self.heater_assist_register = config.get(CONF_HEATER_ASSIST_REGISTER)
         self.sanitize_state_register = config.get(CONF_SANITIZE_STATE_REGISTER)
-        self.heater_assist_trigger_register = config.get(CONF_HEATER_ASSIST_TRIGGER_REGISTER, 4)
+        self.heater_assist_trigger_register = config.get(CONF_HEATER_ASSIST_TRIGGER_REGISTER)
 
         self._client: AsyncModbusTcpClient | None = None
         self._lock = asyncio.Lock()