Test Rules

Fake-timer tests in unit-fast belong in vitest.unit-fast-fake-timers: unit-fast is isolate: false and parallel, so fake timers share worker globals and can hang unrelated real-timer tests.
Async E2E waits synchronize on the state an action produces, never on the action returning: #125441 process readiness after spawn(), #125456 committed form state before Save, #125548 durable draft persistence before reload. Do not substitute longer timeouts, sleeps, retry-wrapped downstream assertions, or trimmed expectation fields.