Test

This runs your full test suite in a smart sequence: diagnostics for type errors first (catches root causes in ~1 second), then unit and integration tests in parallel, then E2E tests only if the fast ones pass. The pre-flight diagnostics step is clever because you get "expected int, got str" instead of mysterious test failures downstream. It uses arbiter agents for the parallel phase and atlas for the slower end-to-end stuff. You can scope it to specific features or run quick checks with just unit tests. The workflow stops early if anything fails, so you're not waiting on slow browser tests when you have a basic type error. Good for pre-commit checks or verifying changes before a merge.