git pkgs diff always shows the full list of added/removed/updated packages. A --stat or --summary flag that outputs aggregate counts would be useful for automated PR descriptions and CI output.

Something like:

$ git pkgs diff main..feature --stat
2 added, 1 removed, 3 updated (1 major, 1 minor, 1 patch)

Similar to how git diff --stat gives a compact overview instead of the full diff. The JSON format already has the raw data to compute this, but having it as a built-in output mode saves post-processing for tools that just need a one-liner.