Release file doesn't always open automatically

A small UX improvement would be to open the release file using the editor of choice. We could have a simple config file in the user's home folder which stores the command to run to open the file, and call that when creating the release file.

Start by tracing the CLI entry point that creates the release file and identify how user-home configuration is currently handled. Define the configuration format and editor command behavior before implementing it, then verify that creating a release file invokes the configured editor and preserves existing behavior when no configuration is present.

Written by the indexing model from the issue text.