proxy.ts already declared auth disabled, but layout.tsx still wrapped the
tree in ClerkProvider and topbar.tsx rendered UserButton. @clerk/nextjs v7
aborts `next build` without a real publishable key, so the image could not
be built at all. Remove the remaining Clerk surface, drop the dependency,
and delete the sign-in/sign-up route groups.
Also fix two pnpm failures this exposed: the deps stage never copied
pnpm-workspace.yaml (so the build-script allowlist was invisible), and
pnpm 11 renamed ignoredBuiltDependencies to allowBuilds. Declare both
spellings and pin packageManager so this cannot drift again.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
