Squashed commit of the following:

commit 7c47604c45e293a29ca31f01e140d621194c0aa6
Author: 2 * r + 2 * t <61896496+soramanew@users.noreply.github.com>
Date:   Sat Jun 14 23:02:06 2025 +1000

    dev: run without installing

src/caelestia/__init__.py

@@ -7,7 +7,3 @@ def main() -> None:
         args.cls(args).run()
     else:
         parser.print_help()
-
-
-if __name__ == "__main__":
-    main()

src/caelestia/__main__.py

@@ -0,0 +1,4 @@
+from . import main
+
+if __name__ == "__main__":
+    main()