Refactor: rename SimDUT, restructure DUT simulation and test flow

docs/usage.rst

@@ -0,0 +1,31 @@
+Usage Guide
+===========
+
+This section describes how to set up and run the test framework.
+
+Quick Start
+-----------
+
+1. Clone the repo and create a virtual environment:
+
+   .. code-block:: bash
+
+      python -m venv .venv
+      source .venv/bin/activate
+      pip install -r requirements.txt
+
+2. Run tests in simulation mode:
+
+   .. code-block:: bash
+
+      pytest --sim
+
+3. View the report:
+
+   - Open `report.html` in your browser.
+
+Switching Between Sim and Hardware
+----------------------------------
+
+Use the `--sim` flag to control which backend is used.
+The system defaults to skipping hardware tests