Use when starting any conversation - establishes Arc's skill routing, instruction priority, and bootstrap rules
$npx -y skills add howells/arc --skill using-arcInstalls into the current project.
Run `npx skills use "https://github.com/howells/arc" --skill "howells/arc/using-arc"` 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/howells/arc" that are relevant to the current task. Run `npx skills add "https://github.com/howells/arc"` and select the relevant skills, then follow their instructions.