Rename config templates: .templ → -sim.json.tpl, config_real.json → -real.json.tpl

Consistent naming: config-sim.json.tpl and config-real.json.tpl.
Update README and TODO references accordingly.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SH2D4LRuCnhLSzoYerAfJX

config-sim.json.tpl

@@ -0,0 +1,44 @@
+{
+	"ambient_temperature": 20,
+	"Controller" : {
+	"stirrer_name": "sim",
+	"plant_name": "sim",
+	"pid_type": "Smith"
+	},
+ 	"TempCtrl": {
+		"Hold": {
+			"kp": 0.4,
+			"ki": 0.0,
+			"kd": 0.0,
+			"kt": 0.0
+		},
+		"Heat": {
+			"kp": 0.08,
+			"ki": 0.02,
+			"kd": 0.0,
+			"kt": 1.5
+		},
+		"Cool": {
+			"kp": 0.08,
+			"ki": 0.02,
+			"kd": 0.0,
+			"kt": 1.5
+		},
+		"Thresholds": {
+			"HoldHeat": 1.0,
+			"HoldCool": 1.0,
+			"HeatHold": 1.0,
+			"HeatCool": 1.0,
+			"CoolHold": 1.0,
+			"CoolHeat": 1.0
+		}
+	},
+	"Heater": {
+		"port": "/dev/ttyUSB0",
+		"speed": "115200"
+	},
+	"Stirrer": {
+		"port": "/dev/ttyACM0",
+		"speed": "115200"
+	}
+}