Create a feature branch with sequential or timestamp numbering
$npx -y skills add mixpanel/mixpanel-headless --skill speckit-git-featureInstalls into the current project.
Run `npx skills use "https://github.com/mixpanel/mixpanel-headless" --skill "mixpanel/mixpanel-headless/speckit-git-feature"` 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/mixpanel/mixpanel-headless" that are relevant to the current task. Run `npx skills add "https://github.com/mixpanel/mixpanel-headless"` and select the relevant skills, then follow their instructions.