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

README.md

@@ -101,11 +101,12 @@ sude/                        Mash schedules ("Sud" = brew/wort), each a
                              per-step stirrer timing, and optional pause
                              for user confirmation.
 
-config.json.templ            Configuration template - the "sim" component
-                             names (stirrer/plant) already default to
-                             simulation; point Stirrer/Heater at real
-                             serial ports and plant_name at a real
-                             backend to switch to hardware.
+config-sim.json.tpl          Configuration template for simulation - all
+                             component names default to "sim"; no hardware
+                             needed.
+config-real.json.tpl         Configuration template for real hardware -
+                             real plant/heater/stirrer backends with the
+                             correct serial ports pre-filled.
 
 web/                         Browser client - static HTML/CSS/JS (no build
                              step, no dependencies), speaking the exact
@@ -217,13 +218,11 @@ pip install -r client/requirements.txt
 
 ## Running
 
-1. Copy `config.json.templ` to `config.json` next to `brewpi.py` - it
-   already runs entirely in simulation (no hardware needed) as-is; switch
-   `stirrer_name`/`plant_name`'s `"sim"` value(s) to a real backend, and
-   set the corresponding serial port, to use real hardware. `plant_name`
-   alone picks the heater/pot/sensor trio together (see `PlantFactory`) -
-   `"sim"` gets `HeaterSim`/`Pot`/`TempSensorSim`, anything else gets
-   `HeaterHendi`/`PotReal`/`TempSensor_max31865`.
+1. Copy `config-sim.json.tpl` (simulation, no hardware needed) or
+   `config-real.json.tpl` (real hardware) to `config.json` next to
+   `brewpi.py`. `plant_name` picks the heater/pot/sensor trio together
+   (see `PlantFactory`) - `"sim"` gets `HeaterSim`/`Pot`/`TempSensorSim`,
+   anything else gets `HeaterHendi`/`PotReal`/`TempSensor_max31865`.
 2. Start the server:
 
    ```bash