Add darwin-arm64 binary for ReScript 12 compatibility (Pexp_function fix)

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: paolobueno

bin/graphql-ppx-darwin-arm64.exe

@@ -1,4 +1,6 @@
 #!/bin/bash
+# Build and copy to bin/ for darwin-arm64 (same as build_and_copy.sh on M1/M2).
 esy b
 mkdir -p bin
-cp _build/default/src/bin/bin.exe binaries/darwin-arm64/bin.exe
+cp _build/default/src/bin/bin.exe bin/graphql-ppx-darwin-arm64.exe
+chmod +x bin/graphql-ppx-darwin-arm64.exe