- Remove globalDependencies **/.env which invalidated all caches on any .env change
- Move 40+ env vars from globalEnv to build-specific env (lint/format/typecheck don't need DB_URL etc.)
- Add per-task inputs with test file exclusions so test changes don't trigger build/typecheck
- Enable affectedUsingTaskInputs for task-level --affected detection
- Add --affected to all turbo commands in CI (lint, format, typecheck, build)
- Add fetch-depth: 0 for proper git history comparison
- Add Docker Buildx + GHA layer caching for E2E builds