perf(repo): verify-perf / memory (tsc --build cache, typecheck concurrency, heap, workspaceConcurrency) - #11

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: pnpm/action-setup@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/