Tests: Add missing copyright header to test_project_sanity.py

Also add some missing docs for this file.

tests/test_project_sanity.py

@@ -1,3 +1,8 @@
+################################################################################
+# Copyright © 2025 Analog Devices Inc. All Rights Reserved.
+# This software is proprietary to Analog Devices, Inc. and its licensors.
+################################################################################
+"""Check if the project is sane."""
 
 import pathlib
 import re
@@ -10,6 +15,8 @@
 
 
 def test_version():
+    """Check if the version in the version file matches the one of the installed package."""
+
     version_file_path = project_root_dir_path / "pytrinamic/version.py"
     version_pattern = re.compile(r"^__version__\s*=\s*['\"]([^'\"]+)['\"]")
     with open(version_file_path, "r") as file: