Enable Turborepo remote caching to share build artifacts across CI runners and developer machines

Steps

1. Authenticate the Turborepo CLI to a remote cache provider: for Vercel Remote Cache run `npx turbo login` and `npx turbo link`, or configure a self-hosted Turborepo Remote Cache server and set `TURBO_API`, `TURBO_TOKEN`, and `TURBO_TEAM` environment variables
2. Confirm `turbo.json` has `pipeline` entries with correct `outputs` arrays for each task — only declared outputs are cached and restored
3. In CI, expose the cache environment variables as CI secrets so that runners can write to and read from the remote cache
4. Run `npx turbo run build test --team=YOUR_TEAM` — on a cache hit Turborepo replays terminal output and restores artifacts without re-executing; on a miss it runs and uploads the result
5. Verify cache hits locally by running the same command twice; the second run should show `>>> FULL TURBO` (all tasks cached) if inputs have not changed
6. Use `--filter` to scope runs to specific packages: `npx turbo run build --filter=@myorg/api...` to build a package and its dependencies only