Refactor: rename SimDUT, restructure DUT simulation and test flow

docs/hardware.rst

@@ -0,0 +1,31 @@
+Real Hardware Integration
+=========================
+
+This page describes how to implement real instrument interfaces.
+
+Backends
+--------
+
+Interfaces expected:
+- Serial-based DUT communication
+- SCPI commands over USB or LAN
+- Future support for Modbus, I2C, or CAN (if needed)
+
+Adding a Real DUT
+------------------
+
+1. Create a `RealDUT` class in `src/instruments/dut_controller.py`
+2. Match the interface used in `SimDUT`
+3. Uncomment the fixture in `conftest.py` to enable
+
+   .. code-block:: python
+
+      # return RealDUT(port="/dev/ttyUSB0")
+
+Safety Tips
+-----------
+
+- Use proper delays when enabling outputs
+- Confirm settings before triggering loads
+- Log all commands during development
+