turborepo

Turborepo monorepo build system guidance. Triggers on: `turbo.json`, task pipelines, `dependsOn`, caching, remote cache, the `turbo` CLI, `--filter`, `--affected`, CI optimization, environment variables, internal packages, monorepo structure, and package boundaries. Use when the user configures tasks or workflows, creates packages, sets up a monorepo, shares code between apps, runs changed packages, debugs cache behavior, or works in an `apps/` plus `packages/` workspace.