fix: prevent duplicated Vercel monorepo root during prebuilt deploy

[atomicdjt]

Root cause

Manual LayerForge preview run #12 successfully completed application verification, token verification, Vercel project linking, configuration pull, and vercel build.

vercel deploy --prebuilt then failed because the project path resolved as:

apps/layerforge-studio/apps/layerforge-studio

The Vercel project already has apps/layerforge-studio configured as its Root Directory, while the workflow also executed the Vercel CLI from that same subdirectory.

Minimal correction

• run Vercel link, pull, build, and deploy --prebuilt from the monorepo root;
• leave application verification scoped by the manifest command;
• leave the Vercel project configuration unchanged;
• add a regression test that prevents working-directory: ${{ matrix.path }} from returning to those four Vercel CLI steps;
• include all deployment workflow regression tests in the existing CI command.

Test-first evidence

Red

Portfolio CI run 230 failed specifically at Test deployment selector after the new regression test detected the four subdirectory-scoped Vercel CLI steps. Documentation and Vercel policy checks passed before the expected failure.

Green

Fresh verification on head 756ff369fd23ffc1cad5a6f1c6e571ccc691f05f:

• Portfolio CI run 231: success
  • documentation links
  • deployment policy
  • selector and workflow regression tests
  • lint
  • typecheck
  • application tests
  • all application builds
• ProcessHarbor Pro Verify run 68: success
• Portfolio Vercel Readiness run 107: success
• Vercel Affected Deployment Plan run 16: success; deployment skipped because pull requests remain plan-only

Safety boundary

• VERCEL_DEPLOYMENT_ORCHESTRATION_ENABLED remains false;
• no deployment was run from this pull request;
• no production alias changed;
• no Vercel project settings changed;
• no application source changed.

[vercel]

Deployment failed with the following error:

Resource is limited - try again in 24 hours (more than 100, code: "api-deployments-free-per-day").

Learn More: https://vercel.com/atomicdjts-projects?upgradeToPro=build-rate-limit