Create Feature Specs for Stage E of the VibeFlow docs-first workflow
$npx -y skills add hardness1020/vibeflow --skill create-feature-specInstalls into the current project.
Run `npx skills use "https://github.com/hardness1020/vibeflow" --skill "hardness1020/vibeflow/create-feature-spec"` 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/hardness1020/vibeflow" that are relevant to the current task. Run `npx skills add "https://github.com/hardness1020/vibeflow"` and select the relevant skills, then follow their instructions.