chore: import upstream snapshot with attribution

scripts/type_check.py

@@ -0,0 +1,16 @@
+#!/usr/bin/env -S uv run
+"""Type-checking script for the project."""
+
+import subprocess
+import sys
+
+
+def main():
+    """Runs type checking on backend."""
+    cmd = ["mypy", "backend/"] + sys.argv[1:]
+    result = subprocess.run(cmd)
+    return result.returncode
+
+
+if __name__ == "__main__":
+    sys.exit(main())