When there were unrecorded changes, the child shell's prompt was exactly the same as normal, which made things quite confusing. This sets a new prompt in red to make that more obvious
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const prompt_command = $"(ansi red)\(system config\)(ansi reset)";
nu --interactive --execute $"cd ($parent_dir); pijul diff -us";
nu --interactive --execute $'$env.PROMPT_COMMAND = {|| "($prompt_command)"}; enter ($parent_dir); pijul diff -us';