🚧 Add build script

run.py

@@ -0,0 +1,11 @@
+"""PyInstaller entry point (absolute imports, no relative package context).
+
+Packaging tools cannot execute ``src/mitsubishi_label_converter/cli.py``
+directly because it uses relative imports; this thin launcher works around
+that by importing the package normally.
+"""
+
+from mitsubishi_label_converter.cli import main
+
+if __name__ == "__main__":
+    raise SystemExit(main())