Setup skill that installs Vercel CLI in agent containers and configures
OneCLI credential injection for api.vercel.com. Container skill bundled
in .claude/skills/add-vercel/container-skills/ and copied to
container/skills/ during setup. Also adds dashboard & web apps prompt
to /setup flow (step 5b).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>