Tests (and any other caller) previously had no way to know when the
Postgres LISTEN behind the reactive event-processing loop had actually
registered, forcing a guessed sleep before relying on it. Mocks now
exposes Ready() <-chan struct{}, closed once listenForNotifications
successfully issues LISTEN. Purely additive - ProcessEvents' signature
is unchanged.
Updates the integration tests to wait on Ready() instead of a flat
sleep, which also cut TestProcessEvents_ReactsToNotification's runtime
from ~0.25s to ~0.06s with no flakes across repeated runs.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XEDaCB7C2NEBgyvqEtZuxY
angelandClaude Sonnet 5