config: wire TempSensor section from config.json to TempSensorSim

PlantFactory.create() now accepts sensor_config dict; extracts type and
kwargs, falls back to sigma=0.05/temp_offset=-0.15 defaults. brewpi.py
passes config.get('TempSensor', {}). Templates updated with full
TempSensor sections.

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

config-sim.json.tpl

@@ -1,7 +1,6 @@
 {
 	"ambient_temperature": 20,
 	"Controller" : {
-	"stirrer_name": "sim",
 	"plant_name": "sim",
 	"pid_type": "Smith"
 	},
@@ -41,5 +40,12 @@
 	"Stirrer": {
 		"port": "/dev/ttyACM0",
 		"speed": "115200"
+	},
+	"TempSensor": {
+		"type": "sim",
+		"temp_offset": 0.0,
+		"sigma": 0.05,
+		"stirrer_sigma": 0.0,
+		"stirrer_tau": 20.0
 	}
 }