Create a new design spec in specs/. Gathers context, explores the codebase, writes the spec with proper frontmatter, and updates specs/README.md. Use when the user says "create a spec", "write a spec", "new spec", or "/spec".
$npx -y skills add changkun/wallfacer --skill wf-spec-createInstalls into the current project.
Run `npx skills use "https://github.com/changkun/wallfacer" --skill "changkun/wallfacer/wf-spec-create"` 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/changkun/wallfacer" that are relevant to the current task. Run `npx skills add "https://github.com/changkun/wallfacer"` and select the relevant skills, then follow their instructions.