Update Main Branch. Use when the user says update, upgrade, pull latest, get latest Main Branch, asks whether they are current, or after Devon announces a new release.
$npx -y skills add noontide-co/mainbranch --skill mb-updateInstalls into the current project.
Run `npx skills use "https://github.com/noontide-co/mainbranch" --skill "noontide-co/mainbranch/mb-update"` and follow the generated skill instructions now. Read its complete output, redirecting it to a temporary file first if necessary. Resolve relative paths from the supporting-files directory it provides.
Use the skills in "https://github.com/noontide-co/mainbranch" that are relevant to the current task. Run `npx skills add "https://github.com/noontide-co/mainbranch"` and select the relevant skills, then follow their instructions.