Add set_ambient_temperature and set_model_plant_params stubs to TempControllerBase

Same pattern as set_model_power: these methods only existed on the Smith
controller, forcing five hasattr guards at call sites. No-op stubs on the
base class give all controllers a stable interface; Smith overrides them.
Remove the now-redundant hasattr guards.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Tqxrk8uj4M3w3d3eXm3xK8

server/brewpi.py

@@ -118,8 +118,7 @@ if __name__ == '__main__':
 	# ever coming from a Sud's own doc.
 	tc = PidFactory.create(config['Controller']['pid_type'], DT)
 	tc.set_params(config['TempCtrl'])
-	if hasattr(tc, 'set_ambient_temperature'):
-		tc.set_ambient_temperature(theta_amb)
+	tc.set_ambient_temperature(theta_amb)
 	tc_task = TcTask(tc, DT_TASK, dispatcher.msgio_get("TempCtrl"))
 	taskmgr.add(tc_task)
 
@@ -171,8 +170,7 @@ if __name__ == '__main__':
 		if 'AmbientTemp' in data:
 			theta_amb = data['AmbientTemp']
 			pot.set_ambient_temperature(theta_amb)
-			if hasattr(tc, 'set_ambient_temperature'):
-				tc.set_ambient_temperature(theta_amb)
+			tc.set_ambient_temperature(theta_amb)
 			forecast_estimator.set_ambient_temperature(theta_amb)
 			await msg_system.send({'AmbientTemp': theta_amb})
 	msg_system.set_recv_handler(on_system_recv)