Refactor: rename SimDUT, restructure DUT simulation and test flow

.gitignore

@@ -1,3 +1,39 @@
-.vscode/
+# Byte-compiled / optimized / DLL files
 __pycache__/
-*.pyc
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+build/
+dist/
+*.egg-info/
+
+# Virtual environments
+.venv/
+env/
+venv/
+
+# Pytest cache
+.pytest_cache/
+
+# Test results and logs
+*.log
+*.csv
+*.html
+
+# VS Code settings
+.vscode/
+
+# Jupyter and IPython
+.ipynb_checkpoints/
+.profile
+
+# Sphinx documentation build
+docs/_build/
+
+# OS files
+.DS_Store
+Thumbs.db