chore: format a bit and add just fmt

justfile

@@ -1,5 +1,9 @@
 all: test docs
 
+test:
+  #!/usr/bin/env nu
+  cargo nextest run
+
 # Compile all documentation as in proposals and design documents, placing them under `docs/compiled`.
 docs:
   #!/usr/bin/env nu
@@ -12,6 +16,8 @@ docs:
     mv $pdf docs/compiled
   } | ignore
 
-test:
+fmt:
   #!/usr/bin/env nu
-  cargo nextest run
+  cargo fmt
+  echo "Places where whitespace is at the end of a line:"
+  rg '\s$'