Adds standalone driver `emboss-format` for `compiler/front_end/format.py`

embossformat

diff --git a/embossformat b/embossformat
new file mode 100755
index 0000000..ccfc57e
--- /dev/null
+++ b/embossformat
@@ -0,0 +1,34 @@
+#!/usr/bin/env python3
+
+# Copyright 2025 Benjamin Olmstead
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Standalone driver program for the Emboss formatter."""
+
+import argparse
+import os
+import sys
+
+
+def main(argv):
+    base_path = os.path.dirname(__file__) or "."
+    sys.path.append(base_path)
+
+    from compiler.front_end import format  # pylint:disable=import-outside-toplevel
+
+    return format.main(argv)
+
+
+if __name__ == "__main__":
+    sys.exit(main(sys.argv))